#!/bin/bash

set -e
set -x

image_size="7G"
kubuntu="kubuntu-19.10-beta-desktop-amd64.iso"
xubuntu="xubuntu-19.10-beta-desktop-amd64.iso"
old_buntu="xubuntu-18.04.3-desktop-amd64.iso"
workspace="/workspace"

# mtools, ddrescure, fdisk, grub, 7z
rm -rf "$workspace/part_files"
mkdir -p "$workspace/part_files"
git -C "$workspace/part_files" clone -b tardis https://git.fsmpi.rwth-aachen.de/osak/lipstick.git .
rsync -av /usr/lib/grub/i386-efi "$workspace/part_files"/grub
rsync -av /usr/lib/grub/i386-pc "$workspace/part_files"/grub
rsync -av /usr/share/grub/themes "$workspace/part_files"/grub
mkdir -p "$workspace/part_files"/grub/fonts/
rsync -av /usr/share/grub/unicode.pf2 "$workspace/part_files"/grub/fonts/

7z x "$old_buntu" -o"$workspace/part_files" EFI/
7z x "$old_buntu" -o"$workspace/part_files" boot/grub/x86_64-efi

mv "$workspace/part_files"/grub/* "$workspace/part_files"/boot/grub/
rm -rf "$workspace/part_files"/grub

rsync --size-only --checksum "$kubuntu" "$workspace/part_files/"
rsync --size-only --checksum "$xubuntu" "$workspace/part_files/"

source ./grub_config.sh # functions to fill grub_template.cfg
cp grub_template.cfg "$workspace/part_files/boot/grub/grub.cfg"
fill_grub_config_template "$kubuntu" "KDE" "$workspace/part_files/boot/grub/grub.cfg"
fill_grub_config_template "$xubuntu" "XFCE" "$workspace/part_files/boot/grub/grub.cfg"

wget -nc -P "$workspace/part_files/" https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.0.5/linux-headers-5.0.5-050005_5.0.5-050005.201903271212_all.deb
wget -nc -P "$workspace/part_files/" https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.0.5/linux-image-unsigned-5.0.5-050005-generic_5.0.5-050005.201903271212_amd64.deb
wget -nc -P "$workspace/part_files/" https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.0.5/linux-modules-5.0.5-050005-generic_5.0.5-050005.201903271212_amd64.deb
./create_offlinerepo.sh "$workspace/part_files/archives" "$kubuntu" $(grep '^[^#]' packages | cut -d'|' -f 2)
./create_offlinerepo.sh "$workspace/part_files/archives" "$xubuntu" $(grep '^[^#]' packages | cut -d'|' -f 2)
cp packages "$workspace/part_files/packages"
echo "ubiquity ubiquity/keep-installed string $(grep '^[^#]' packages | cut -d'|' -f 2 | tr '\n' ' ')" >> "$workspace/part_files/preseed/lip.seed"

rm -f "$workspace/part.img"
truncate -s "$image_size" "$workspace/part.img"
mkfs.vfat -n "LIPSTICK" "$workspace/part.img"
MTOOLS_SKIP_CHECK=1 mcopy -i "$workspace/part.img" -b -s -v "$workspace/part_files"/* "$workspace/part_files"/.git ::
grub-mkimage --prefix "(hd0,msdos1)/boot/grub" --output "$workspace/grub.i386-pc.img" --format "i386-pc" part_msdos fat ext2 biosdisk
dd if=/usr/lib/grub/i386-pc/boot.img of="$workspace/output.img" bs=446 count=1
dd if="$workspace/grub.i386-pc.img" of="$workspace/output.img" bs=512 seek=1
ddrescue --output-position=2048s --sparse "$workspace/part.img" "$workspace/output.img"
printf "label: dos\nunit: sectors\n2048,+,b,*\n" | sfdisk "$workspace/output.img"
echo "Used $(du -s -h "$workspace/part_files" | cut -f1) of ${image_size}"