#!/bin/bash
# Copy NFS-booted Debian to the local drive and setup boot
# Install with grub-pc (non-UEFI boot)

set -e

DEV=$1

if [ ! -b $DEV ]; then
    echo "USAGE: $0 /dev/sdXXX (sdXXX must be a block device)"
    exit 1
fi

PART=${DEV}1

mkdir -p /root/target

# Unmount old chroot-mounts if any
for i in boot/efi dev/pts dev proc sys; do
    if grep -q " /root/target/$i " /proc/mounts; then
        umount /root/target/$i
    fi
done
if grep -q " /root/target " /proc/mounts; then
    umount /root/target
fi

# Check if $PART already contains a filesystem
if mount $PART /root/target &>/dev/null; then
    umount /root/target
    if [ "$WIPE" = "1" ]; then
        echo "Device $PART already contains a filesystem. WIPE=1 specified. Wiping"
        wipefs -a $DEV
    else
        echo "Device $PART already contains a filesystem. Wipe it first"
        exit 1
    fi
fi

# Make root partition
SIZE=`blockdev --getsz $DEV`
ROOT_SIZE=$((SIZE-2048-1048576))
sfdisk $DEV <<EOF
label: dos

${DEV}1 : start=2048, type=83
EOF

mkfs.ext4 -F $PART

UUID=`blkid -o value -s UUID $PART`

# Mount new filesystems
mount $PART /root/target

# Copy Debian to the new partition
cp -av /overlay/lower/* /root/target

# Remove overlayroot from initramfs settings
rm /root/target/etc/initramfs-tools/hooks/hooks-overlay
rm /root/target/etc/initramfs-tools/scripts/init-bottom/init-bottom-overlay
>/root/target/etc/initramfs-tools/modules
cat >/root/target/etc/initramfs-tools/initramfs.conf <<EOF
MODULES=most
BUSYBOX=auto
KEYMAP=n
COMPRESS=gzip
DEVICE=
EOF

# Remove ssh-keygen -A
(echo '#!/bin/bash'; echo 'exit 0') > /root/target/etc/rc.local

# Set fstab
cp /etc/resolv.conf /root/target/etc/resolv.conf
cat >/root/target/etc/fstab <<EOF
UUID=$UUID / ext4 rw,relatime 0 0
EOF

# Install GRUB
for i in dev dev/pts proc sys; do mount --bind /$i /root/target/$i; done
chroot /root/target <<EOF
ssh-keygen -A
DEBIAN_FRONTEND=noninteractive apt-get -o Dpkg::Options::="--force-confdef" -o Dpkg::Options::="--force-confold" -y install grub-pc
update-initramfs -u -k all
update-grub
grub-install $DEV
EOF
for i in dev/pts dev proc sys; do umount /root/target/$i; done

# Unmount filesystems
umount /root/target