#!/usr/bin/env bash
set -e

### Install requirements
export DEBIAN_FRONTEND=noninteractive
apt-get -qq update && apt-get -qq -y install grub-pc

### Wipe all partitions on the existing disk
wipefs -q --all --force /dev/sda

### Create and partition to allow kickstarts
parted -s /dev/sda mklabel msdos
parted -s /dev/sda mkpart primary 4M 200M
mkfs.ext4 -q -L OEMDRV /dev/sda1
mount /dev/sda1 /boot

### Download kernel and installer initrd to kickstart partition
curl -SsfL -o /boot/vmlinuz "$BUILD_MIRROR/BaseOS/x86_64/os/isolinux/vmlinuz"
curl -SsfL -o /boot/initrd.img "$BUILD_MIRROR/BaseOS/x86_64/os/isolinux/initrd.img"

### Install and configure Grub to load the installer initrd
grub-install --no-floppy /dev/sda
cat >/boot/grub/grub.cfg <<EOF
set default=0
set timeout=5
menuentry "Kickstart Rocky Linux" {
set root=(hd0,1)
linux /vmlinuz ip=dhcp
initrd /initrd.img
}
EOF

mv /root/ks.cfg /boot/ks.cfg

shutdown -r now