use fmt;
use fs;
use io;
use os;

use gpt;

export fn mkvol(vol: str) io::file = {
	return match (os::create(vol, fs::mode::USER_RWX | fs::mode::GROUP_RX | fs::mode::OTHER_RX, fs::flags::RDWR)) {
	case let v: io::file =>
		yield v;
	case =>
		fmt::fatalf("{}: cannot open file {}", os::args[0], vol);
	};
};

export fn openvol(vol: str) io::file = {
	return match (os::open(vol, fs::flags::RDWR)) {
	case let v: io::file =>
		yield v;
	case =>
		fmt::fatalf("{}: cannot open file {}", os::args[0], vol);
	};
};

export fn opengpt(vol: str) *gpt::gpt = {
	const vol = openvol(vol);
	
	return match (gpt::from(vol)) {
	case let g: *gpt::gpt =>
		yield g;
	case io::error =>
		fmt::fatalf("{}: could not properly read disk {}", os::args[0], os::args[1]);
	case =>
		fmt::fatalf("{}: no valid gpt in disk", os::args[0]);
	};
};