windvn/path/make-image-raw

#!/usr/bin/env bash
set -e
if
	export DISK_IMAGE="$2"
	export ROOT_MOUNT="$OPUS_OUTPUT/mount"

	# Get the approximate size required for the image
	export DISK_SIZE=$(du -sb "$1" | cut -f1)
	# Add 256MB for SWAP, and 700MB for overhead
	export DISK_SIZE=$(( $DISK_SIZE + ( 256 * 1000000 ) + ( 700 * 1000000 ) ))

	# Create and mount disk
	fallocate -l $DISK_SIZE "$DISK_IMAGE"
	export DISK_LOOP="$(losetup --show -f -P "$DISK_IMAGE")"

	# Partition disk
	(
	echo n
	echo e
	echo 
	echo 
	echo +256M
	echo t
	echo swap
	echo n
	echo p
	echo 
	echo 
	echo 
	echo t
	echo 
	echo linux
	echo w
	echo 
	echo 
	) | fdisk "$DISK_LOOP"

	# Format partions
	mkswap "${DISK_LOOP}p1"
	mkfs.ext4 "${DISK_LOOP}p2"

	# Mount root
	mkdir "$ROOT_MOUNT"
	mount "${DISK_LOOP}p2" "$ROOT_MOUNT"

	# Add files
	dupe "$1/." "$ROOT_MOUNT"

	# Make fstab
	echo "UUID=$(blkid -o value -s UUID "${DISK_LOOP}p1") none swap sw 0 0" >"$ROOT_MOUNT/etc/fstab"
	echo "UUID=$(blkid -o value -s UUID "${DISK_LOOP}p2") / ext4 errors=remount-ro 0 1" >>"$ROOT_MOUNT/etc/fstab"

	# Set up GRUB and misc
	fchroot "$ROOT_MOUNT" "/setupdisk"

	# Clear logs
	find "$ROOT_MOUNT/var/log" -type f -delete

	# Unmount root
	umount -l "$ROOT_MOUNT"
	rmdir "$ROOT_MOUNT"
	losetup -d "$DISK_LOOP"
then
	set +e
else
	set +e
	echo 
	echo Script execution ended due to error. Cleaning up...
	umount -l "$ROOT_MOUNT"
	rmdir "$ROOT_MOUNT"
	losetup -d "$DISK_LOOP"
	echo Script execution ended due to error.
	exit 1
fi