#!/bin/bash
set -e


rm -rf *.iso*
rm -rf iso
# Download ISO Installer:
wget https://releases.ubuntu.com/20.04.1/ubuntu-20.04.1-live-server-amd64.iso

# Create ISO distribution dirrectory:
mkdir -p iso/nocloud/

# Extract ISO:
7z x ubuntu-20.04.1-live-server-amd64.iso -x'![BOOT]' -oiso

# Create empty meta-data file:
touch iso/nocloud/meta-data

# Copy user-data file:
cp user-data iso/nocloud/user-data

# Update boot flags with cloud-init autoinstall:
## Should look similar to this: initrd=/casper/initrd quiet autoinstall ds=nocloud;s=/cdrom/nocloud/ ---
sed -i 's|---|autoinstall ds=nocloud\\\;s=/cdrom/nocloud/ ---|g' iso/boot/grub/grub.cfg
sed -i 's|---|autoinstall ds=nocloud;s=/cdrom/nocloud/ ---|g' iso/isolinux/txt.cfg

# Disable mandatory md5 checksum on boot:
md5sum iso/README.diskdefines > iso/md5sum.txt
sed -i 's|iso/|./|g' iso/md5sum.txt


# Create Install ISO from extracted dir (Ubuntu):
xorriso -as mkisofs -r \
  -V Ubuntu\ custom\ amd64 \
  -o ubuntu-20.04-live-server-amd64-autoinstall.iso \
  -J -l -b isolinux/isolinux.bin -c isolinux/boot.cat -no-emul-boot \
  -boot-load-size 4 -boot-info-table \
  -eltorito-alt-boot -e boot/grub/efi.img -no-emul-boot \
  -isohybrid-gpt-basdat -isohybrid-apm-hfsplus \
  -isohybrid-mbr isohdpfx.bin  \
  iso/boot iso