git filter-branch -f --prune-empty --tree-filter '
if [ -f .gitattributes ]; then
	git rm -f .gitattributes
fi
find * -type f | while read FILE; do
	while head -2 "$FILE" | grep -q "^oid sha256"; do
		ref=$(cat "$FILE")
		echo -n "$ref" | git lfs smudge > "$FILE"
		git add "$FILE"
	done
done' --tag-name-filter cat -- --all