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vm.go
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vm.go
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package vm
import (
"io"
"io/fs"
"os"
multierror "github.com/hashicorp/go-multierror"
"golang.org/x/xerrors"
"github.com/masahiro331/go-disk"
"github.com/masahiro331/go-vmdk-parser/pkg/virtualization/vmdk"
"github.com/masahiro331/go-xfs-filesystem/xfs"
)
func Open(f *os.File, partitionName string) (fs.FS, error) {
reader, err := detectVM(f)
if err != nil {
return nil, xerrors.Errorf("failed to detect virtual machine type: %w", err)
}
f.Seek(0, 0)
driver, err := disk.NewDriver(reader)
if err != nil {
return nil, xerrors.Errorf("failed to new disk driver: %w", err)
}
var diskReader io.SectionReader
for {
partition, err := driver.Next()
if err != nil {
if err == io.EOF {
break
}
return nil, xerrors.Errorf("failed to next disk error: %w", err)
}
if partition.Name() == partitionName && !partition.Bootable() {
diskReader = partition.GetSectionReader()
break
}
}
filesystem, err := detectFS(diskReader)
if err != nil {
return nil, xerrors.Errorf("failed to detect filesystem error: %w", err)
}
return filesystem, nil
}
func detectFS(reader io.SectionReader) (fs.FS, error) {
ok := xfs.Check(&reader)
reader.Seek(0, io.SeekStart)
var errs error
if ok {
filesystem, err := xfs.NewFS(reader)
if err != nil {
errs = multierror.Append(errs, err)
}
return filesystem, err
}
return nil, errs
}
func detectVM(f *os.File) (*io.SectionReader, error) {
var errs error
ok, err := vmdk.Check(f)
if err != nil {
errs = multierror.Append(errs, err)
}
f.Seek(0, io.SeekStart)
if ok {
reader, err := vmdk.Open(f)
if err != nil {
return nil, xerrors.Errorf("failed to open vmdk: %w", err)
}
return reader, nil
}
// TODO: Support VHD, VHDX, QCOW2
return nil, multierror.Append(errs, xerrors.New("unsupported virtual machine image"))
}