File creatediskimage of Package image-qemu

#!/bin/bash
set -e

# size in MB
esp_size=100
img_size=1024

image="${1:?}"
efi="${2:?}"
data="${3:?}"

tmpdir=$(mktemp -d -t mkimage.XXXXXX)
cleanup()
{
	rm -rf "$tmpdir"
}
trap cleanup EXIT

esp="$tmpdir/esp"
/usr/sbin/mkfs.vfat -C "$esp" $[$esp_size*1024]
while read file; do
	if [ -d "$efi/$file" ]; then
		mmd -i "$esp" "::$file"
	else
		mcopy -i "$esp" "$efi/$file" "::$file"
	fi
done < <(find "$efi" -mindepth 1 -printf '%P\n')
du -sh "$esp"

img="$image.new"
truncate -s "${img_size}M" "$img"
/usr/sbin/sfdisk "$img" <<EOF
label: gpt

type="EFI System", size=100MiB, bootable
type="Linux root (ARM-64)"
EOF

/usr/sbin/sfdisk -J "$img" > "$tmpdir/partitions.json" 
cat "$tmpdir/partitions.json"
mapfile -t offsets < <(jq '.partitiontable.partitions[]|.start' "$tmpdir/partitions.json")
mapfile -t sizes < <(jq '.partitiontable.partitions[]|.size' "$tmpdir/partitions.json")
echo "${offsets[@]}"

if [ -z "$ROOTFS_UUID" ]; then
	if [ -e "$image.rootfs_uuid" ]; then
		read -r ROOTFS_UUID < "$image.rootfs_uuid"
	else
		ROOTFS_UUID=$(uuidgen)
	fi
fi
[ -e "$image.rootfs_uuid" ] || echo "$ROOTFS_UUID" > "$image.rootfs_uuid"
dd if="$esp" of="$img" bs=512 seek="${offsets[0]}" status=none conv=notrunc
fakeroot /usr/sbin/mkfs.ext4 -F -L rootfs -U "${ROOTFS_UUID}" -d "$data" -E no_copy_xattrs,root_owner=0:0,offset="$[${offsets[1]}*512]" "$img" "$[${sizes[1]}*512/1024]k"
mv "$img" "$image"