#!/bin/bash

# enable for debugging (single stepping line by line)
#set -x
#trap read debug

exec > >(tee -i logfile.txt)
exec 2>&1

# configuration

INSTALL_DRIVE=/dev/vda
PARTITION_BOOT=1
PARTITION_ROOT=2
LABEL_ROOT=ROOT
MOUNT_PATH=/mnt
HOST=192.168.130.1
HTTP_SERVER=http://${HOST}:8088
IP=192.168.130.101
NETWORK=192.168.130.0
NETMASK=255.255.255.0
PREFIX=24
HOSTNAME=arch32

# set up networking
ip addr add dev eth0 ${IP}
ip route add to ${NETWORK}/${PREFIX} dev eth0 via ${HOST}
ip route add to default dev eth0 via ${HOST}
cat > /etc/resolv.conf <<EOF
nameserver 8.8.8.8
EOF

# create early SSH access

echo 'root:xx' | chpasswd
echo "PermitRootLogin yes" >> /etc/ssh/sshd_config
systemctl start sshd

echo "Partitioning and creating filesystem.."

mknod /dev/vda b 254 0
mknod /dev/vda1 b 254 1
mknod /dev/vda2 b 254 2

wipefs -a ${INSTALL_DRIVE}

printf ",128M,L,*\n" | /sbin/sfdisk -f ${INSTALL_DRIVE}
printf ",,L,*\n" | /sbin/sfdisk -a -f ${INSTALL_DRIVE}

mkfs.ext2 ${INSTALL_DRIVE}${PARTITION_BOOT}
mkfs.ext4 ${INSTALL_DRIVE}${PARTITION_ROOT}

mount ${INSTALL_DRIVE}${PARTITION_ROOT} ${MOUNT_PATH}
mkdir ${MOUNT_PATH}/boot
mount ${INSTALL_DRIVE}${PARTITION_BOOT} ${MOUNT_PATH}/boot

echo "Patching pacman to play locally.."

cat >/etc/pacman.d/mirrorlist <<EOF
Server = ${HTTP_SERVER}/mirror/\$arch/\$repo
EOF

echo "Installing keyring for ArchLinux32."

sed -i 's/^SigLevel.*/SigLevel = Never/g' /etc/pacman.conf
sed -i '/CheckSpace/ a DisableDownloadTimeout' /etc/pacman.conf
pacman --noconfirm -Syyw archlinux32-keyring
pacman --noconfirm -U /var/cache/pacman/pkg/archlinux32-keyring-*.pkg.tar.xz

echo "Installing minimalistic base system.."

pacstrap ${MOUNT_PATH} filesystem grep findutils coreutils glibc bash pacman \
	mkinitcpio linux dhcpcd systemd sed systemd-sysvcompat

sed -i 's/^SigLevel.*/SigLevel = Never/g' ${MOUNT_PATH}/etc/pacman.conf

cat >${MOUNT_PATH}/etc/pacman.d/mirrorlist <<EOF
Server = ${HTTP_SERVER}/mirror/\$arch/\$repo
EOF

# pin the architecture
sed -i 's/^Architecture.*/Architecture=i686/' ${MOUNT_PATH}/etc/pacman.conf

echo "Test if we can update the system inside chroot."
arch-chroot ${MOUNT_PATH} pacman -Syyu --noconfirm

echo "Install /etc/fstab"
genfstab -L -p ${MOUNT_PATH} > ${MOUNT_PATH}/etc/fstab

echo "Installing boot loader.."

arch-chroot ${MOUNT_PATH} pacman --noconfirm -S grub
arch-chroot ${MOUNT_PATH} grub-install --force /dev/vda
arch-chroot ${MOUNT_PATH} grub-mkconfig -o /boot/grub/grub.cfg

echo "Configuring base system.."

sed -i 's/^#en_US.UTF-8 UTF-8/en_US.UTF-8 UTF-8/g' ${MOUNT_PATH}/etc/locale.gen
arch-chroot ${MOUNT_PATH} locale-gen
echo LANG=en_US.UTF-8 > ${MOUNT_PATH}/etc/locale.conf

ln -fs /usr/share/zoneinfo/Europe/Zurich ${MOUNT_PATH}/etc/localtime
arch-chroot ${MOUNT_PATH} hwclock --systohc --utc

echo ${HOSTNAME} > ${MOUNT_PATH}/etc/hostname

cat > ${MOUNT_PATH}/etc/systemd/network/25-wired.network <<EOF
[Match]
Name=enp1s0

[Network]
Address=${IP}/${PREFIX}
Gateway=${HOST}
EOF

ln -sf ../run/systemd/resolve/stub-resolv.conf /etc/resolv.conf

arch-chroot ${MOUNT_PATH} systemctl enable systemd-networkd
arch-chroot ${MOUNT_PATH} systemctl enable systemd-resolved

arch-chroot ${MOUNT_PATH} sh -c "echo 'root:xx' | chpasswd"

arch-chroot ${MOUNT_PATH} pacman --noconfirm -S openssh
echo "PermitRootLogin yes" >>${MOUNT_PATH}/etc/ssh/sshd_config
arch-chroot ${MOUNT_PATH} systemctl enable sshd

# maybe later, when pacman knows the Archlinux32 developer keys
#sed -i 's/^SigLevel.*/SigLevel = Required DatabaseOptional/g' ${MOUNT_PATH}/etc/pacman.conf

echo "Unmounting.."

umount ${MOUNT_PATH}/boot
umount ${MOUNT_PATH}

echo "Powering off.."

sleep 10

systemctl poweroff