fatresizebug.sh

#!/bin/bash

set -ex

dev="/dev/sda"

# sudo apt install qemu qemu-utils qemu-system ovmf

qemu() {
  qemu-system-x86_64 \
    -m 512 \
    -machine q35,accel=kvm \
    -cpu host \
    -drive file=${dev},if=none,format=raw,id=dev \
    -usb \
    -device usb-storage,drive=dev \
    -boot menu=on
}

# get the installer, write to usb
wget -N http://deb.debian.org/debian/dists/trixie/main/installer-amd64/current/images/hd-media/boot.img.gz
gunzip --keep --force boot.img.gz
sudo dd status=progress if=boot.img of=${dev}

# boots to installer (close qemu window to exit)
qemu

fatresize --progress --verbose --size 2G ${dev}

# boot error:
qemu