use fmt;
use io;

use cmd;
use gpt;

export fn mkbackup(args: []str) void = {
	const fd = cmd::openfile();
	defer io::close(fd)!;

	const vol = match(gpt::from(fd)) {
	case let g: *gpt::gpt =>
		yield g;
	case gpt::nogpt =>
		fmt::fatalf("{}: disk does not have valid gpt", args[0]);
	case =>
		fmt::fatalf("{}: could not access volume", args[0]);
	};
	defer {
		gpt::commit(vol)!;	
		gpt::finish(vol);
	};

	gpt::mkbackup(vol);
};