disk.go

package disk

import (
	"io"

	"github.com/masahiro331/go-disk/fs"
	"github.com/masahiro331/go-disk/gpt"
	"github.com/masahiro331/go-disk/mbr"
	"github.com/masahiro331/go-disk/types"
	"golang.org/x/xerrors"
)

func NewDriver(sr *io.SectionReader, checkFsFuncs ...fs.CheckFsFunc) (types.Driver, error) {
	m, err := mbr.NewMasterBootRecord(sr)
	if err != nil {
		if xerrors.Is(mbr.InvalidSignature, err) {
			ok, err := fs.CheckFileSystems(sr, checkFsFuncs)
			if err != nil {
				return nil, xerrors.Errorf("failed to check filesystem: %w", err)
			}
			if ok {
				return fs.NewDirectFileSystem(sr)
			}
		}
		return nil, xerrors.Errorf("failed to new MBR: %w", err)
	}

	g, err := gpt.NewGUIDPartitionTable(sr)
	if err != nil {
		if m.UniqueMBRDiskSignature != [4]byte{0x00, 0x00, 0x00, 0x00} {
			return m, nil
		}
		return nil, xerrors.Errorf("failed to parse GUID partition table: %w", err)
	}

	return g, nil
}