#!/bin/bash

# based on https://www.tuicool.com/articles/7jaAZj
# but works with GPT (3TB disks) and auto-inherits IP from rescue host.

set -e

DEVS='/dev/sda /dev/sdb'
ROOT=${ROOT:-/mnt}
ROOT_DEV=${ROOT_DEV:-/dev/md0}

HOST=${HOST:-void-linux}
REPO=${REPO:-https://repo.voidlinux.eu/current}

BASE_PACKAGES='
  base-system bash util-linux procps-ng tzdata openssh dhcpcd iputils
  parted go nginx postfix perl firejail strace
  grub mdadm iptables vim inetutils-ifconfig chrony dcron metalog'

PARTED="parted -a optimal"

for d in $DEVS; do
  wipefs -a $d
  $PARTED $d mktable gpt

  $PARTED $d mkpart grub ext2 1 2
  $PARTED $d set 1 bios_grub on

  $PARTED $d mkpart EFI fat32 2 512M
  $PARTED $d set 2 boot on

  $PARTED $d mkpart root ext4 512M 80G
  $PARTED $d set 3 raid on

  $PARTED $d disk_set pmbr_boot on
done

sleep 4 # give kernel some time to rescan devices.

RD=""
for d in $DEVS; do
  mkfs.fat -F32 ${d}2
  RD+="${d}3 "
done


mdadm --create --verbose --level=1 --raid-devices=2 --metadata=0.9 $ROOT_DEV $RD

mkfs.ext4 -q -L root $ROOT_DEV
mount $ROOT_DEV $ROOT

mkdir $ROOT/dev $ROOT/proc $ROOT/sys
mount --rbind /dev $ROOT/dev
mount --rbind /proc $ROOT/proc
mount --rbind /sys $ROOT/sys

curl https://repo.voidlinux.eu/static/xbps-static-latest.x86_64-musl.tar.xz | tar xJ 

./usr/bin/xbps-install -r $ROOT -R $REPO -Sy $BASE_PACKAGES

cat /etc/resolv.conf > $ROOT/etc/resolv.conf

chroot $ROOT /bin/bash <<EOF
. /etc/profile

# fixup basic installation
chown root.root /
chmod 0755 /
for svc in sshd metalog dcron chronyd ; do
  echo "Enabling \$svc"
  ln -s /etc/sv/\$svc /etc/runit/runsvdir/current/
done

echo "en_US.UTF-8 UTF-8" >>/etc/default/libc-locales
xbps-reconfigure -f glibc-locales


echo "# inheriting current IPv4 config"
IP=$(ip addr show eth0 | grep -w inet | awk '{print $2}')
ROUTE=$(ip route | grep ^default | awk '{print $3}')

echo "ip link set dev eth0 up"          >> /etc/rc.local
echo "ip addr add \$IP brd + dev eth0"  >> /etc/rc.local
echo "ip route add default via \$ROUTE" >> /etc/rc.local
# fix interface?
sed -i 's/eth0/enp4s0/' /etc/rc.local 

echo "# generating mdraid.confg"
mdadm --detail --scan    >> /etc/mdadm.conf
echo mdadmconf=yes > /etc/dracut.conf.d/mdadmconf.conf
sed -i 's/\(GRUB_CMDLINE_LINUX_DEFAULT=.*\)"/\1 rd.md=1 rd.auto=1"/' /etc/default/grub

echo "# installing GRUB bootloader on $DEVS"
for d in $DEVS; do
  echo "# -> installing grub on \$d"
  grub-install \$d
done

echo "# reconfiguring installed kernel..."
xbps-query -l|grep linux4|awk '{print "xbps-reconfigure -f " \$2}' | sh
ls -l /boot/grub/grub.cfg


passwd
EOF