#!/bin/sh
# Nico Schottelius, 2019-12-09

set -e
set -x

if [ $# -ne 3 ]; then
    echo $0 suite keyfile disk
    echo suite: beowulf or similar
    echo keyfile: file containing the ssh keys
    echo disk: the block device
    exit 1
fi

suite=$1; shift
keyfile=$1; shift
disk=$1; shift

case $disk in
    /dev/sd*)
        partition=${disk}1
        ;;
    /dev/mmcblk*|/dev/nvme*|/dev/loop*)
        partition=${disk}p1
        ;;
    *)
        echo "Unsupported disk - edit this script" >&2
        exit 1
        ;;
esac

chroot_dir=$(mktemp -d)
date=$(date +%F)

################################################################################
# Disk preparation

# Clean the first 2M - getting rid of old things
# in the gap and also the paritition table
dd if=/dev/zero of=${disk} bs=1M count=2

# Partition disk with 1 Linux partition
sudo sfdisk "$disk" <<EOF
label: dos
,,L
EOF

partprobe "${disk}"
sleep 3

# For creation, if an existing filesystem is on the partitions
mkfs.ext4 -F ${partition}

mount ${partition} ${chroot_dir}

# Devuan: debootstrap beowulf /tmp/tmp.teGuJxytz0 http://packages.devuan.org/devuan
debootstrap "${suite}" "${chroot_dir}"

# need non-free for firmware-bnx2
echo "deb http://pkgmaster.devuan.org/merged ${suite} main contrib non-free" > ${chroot_dir}/etc/apt/sources.list

chroot ${chroot_dir} apt update
chroot ${chroot_dir} apt install  -y openssh-server rdnssd linux-image-amd64 firmware-bnx2 ifenslave vlan grub-pc

echo "unconfigured-host" > ${chroot_dir}/etc/hostname

echo '* * * * * root ip -o -6 addr show | grep -E -v " lo |one" > /etc/issue' > ${chroot_dir}/etc/cron.d/ipv6addr

mkdir -p ${chroot_dir}/root/.ssh

cat ${keyfile} > ${chroot_dir}/root/.ssh/authorized_keys

# Fix possible permission issue from above
chmod -R og-rwx ${chroot_dir}/root/

################################################################################
# networking

# echo bonding

cat > ${chroot_dir}/etc/network/interfaces << EOF
auto lo
iface lo inet loopback

# I would like to have a generic block like this below
# But as long as interface
auto bond0
iface bond0 inet manual
  bond-miimon 500
  bond-mode 4
  post-up /sbin/ip link set \$IFACE mtu 9000
  bond-slaves none

auto eth0
iface eth0 inet manual
  bond-master bond0
  post-up /sbin/ip link set \$IFACE mtu 9000

auto eth1
iface eth1 inet manual
  bond-master bond0
  post-up /sbin/ip link set \$IFACE mtu 9000

EOF

for dir in dev sys proc; do
    mount --bind /${dir} ${chroot_dir}/${dir}
done

chroot ${chroot_dir} grub-install ${disk}
# Ensure boot loader has a configuration
chroot ${chroot_dir} grub-mkconfig -o /boot/grub/grub.cfg

for dir in dev sys proc; do
    umount ${chroot_dir}/${dir}
done

umount ${chroot_dir}
sync

rmdir ${chroot_dir}