# Partition DISK: GPT, 512M EFI + rest ext4 root. Mounts root at /mnt, ESP at /mnt/boot.
# Sourced by run.sh (DISK comes from system.conf).

part() { case "$DISK" in *nvme*|*mmcblk*) echo "${DISK}p$1" ;; *) echo "${DISK}$1" ;; esac; }
EFI="$(part 1)"; ROOT="$(part 2)"

info "partitioning $DISK"
sgdisk --zap-all "$DISK"
sgdisk -n1:0:+512M -t1:ef00 -c1:EFI  "$DISK"
sgdisk -n2:0:0     -t2:8300 -c2:root "$DISK"
partprobe "$DISK"; sleep 1

mkfs.fat -F32 "$EFI"
mkfs.ext4 -F "$ROOT"

mount "$ROOT" /mnt
mount --mkdir "$EFI" /mnt/boot   # ESP at /boot so the kernel + initramfs land on it