create_win11_usb

create_win11_usb

#!/bin/bash

# Based on: https://nixaid.com/bootable-usb-windows-linux/
# Dependencies: ntfs-3g rsync

set -euo pipefail

iso="$1"
drive="$2"

script="$(readlink -f "$0")"

log() { echo "$@" >&2; }
die() { log "$@"; exit 1; }

if [ ! -f "$iso" ]; then
	die "ISO doesn't exist or is not a file: $iso"
fi

if [ ! -b "$drive" ]; then
	die "drive doesn't exist or is not a block device: $drive"
fi

if [ "${CREATE_WIN11_USB_INSIDE_NS:-}" != 1 ]; then
	export CREATE_WIN11_USB_INSIDE_NS=1
	exec unshare --mount "$script" "$@"
fi

set -x

# Use a path that we can easily append partition IDs to
drive="/dev/disk/by-id/$(lsblk -dno ID-LINK "$drive")"
part_boot="$drive-part1"
part_install="$drive-part2"

# Make sure our changes to /mnt won't be visible to the parent namespace
if mountpoint -q /mnt; then
	umount -R /mnt
fi
mount -t tmpfs tmpfs /mnt

# Create partition table
wipefs -a "$drive"
sfdisk "$drive" <<EOF
label: gpt
unit: sectors

start=2048, size=2095104, type=EBD0A0A2-B9E5-4433-87C0-68B6B72699C7, name="BOOT"
start=2097152, size=18874368, type=EBD0A0A2-B9E5-4433-87C0-68B6B72699C7, name="INSTALL"
EOF

# Wait for udev to create partition nodes
udevadm settle --timeout=15 --exit-if-exists="$part_boot"
udevadm settle --timeout=15 --exit-if-exists="$part_install"

# Mount ISO
mount --mkdir "$iso" /mnt/iso

# Format boot partition
mkfs.vfat -n BOOT "$part_boot"
mount --mkdir "$part_boot" /mnt/boot

# Copy files to boot partition
rsync -r --progress --exclude sources --delete-before /mnt/iso/ /mnt/boot/
mkdir /mnt/boot/sources
cp /mnt/iso/sources/boot.wim /mnt/boot/sources/

# Format install partition
mkfs.ntfs --quick -L INSTALL "$part_install"
mount --mkdir "$part_install" /mnt/install

# Copy files to install partition
rsync -r --progress --delete-before /mnt/iso/ /mnt/install/

# Cleanup
umount -R /mnt
sync

log "Successful"