lotus/lib/tarutil/systar.go

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package tarutil
import (
"archive/tar"
"golang.org/x/xerrors"
"io"
"io/ioutil"
"os"
"path/filepath"
logging "github.com/ipfs/go-log/v2"
)
var log = logging.Logger("tarutil")
func ExtractTar(body io.Reader, dir string) error {
if err := os.MkdirAll(dir, 0755); err != nil {
return xerrors.Errorf("mkdir: %w", err)
}
tr := tar.NewReader(body)
for {
header, err := tr.Next()
switch err {
default:
return err
case io.EOF:
return nil
case nil:
}
f, err := os.Create(filepath.Join(dir, header.Name))
if err != nil {
return xerrors.Errorf("creating file %s: %w", filepath.Join(dir, header.Name), err)
}
if _, err := io.Copy(f, tr); err != nil {
return err
}
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if err := f.Close(); err != nil {
return err
}
}
}
func TarDirectory(dir string) (io.ReadCloser, error) {
r, w := io.Pipe()
go func() {
_ = w.CloseWithError(writeTarDirectory(dir, w))
}()
return r, nil
}
func writeTarDirectory(dir string, w io.Writer) error {
tw := tar.NewWriter(w)
files, err := ioutil.ReadDir(dir)
if err != nil {
return err
}
for _, file := range files {
h, err := tar.FileInfoHeader(file, "")
if err != nil {
return xerrors.Errorf("getting header for file %s: %w", file.Name(), err)
}
if err := tw.WriteHeader(h); err != nil {
return xerrors.Errorf("wiritng header for file %s: %w", file.Name(), err)
}
f, err := os.OpenFile(filepath.Join(dir, file.Name()), os.O_RDONLY, 644)
if err != nil {
return xerrors.Errorf("opening %s for reading: %w", file.Name(), err)
}
if _, err := io.Copy(tw, f); err != nil {
return xerrors.Errorf("copy data for file %s: %w", file.Name(), err)
}
if err := f.Close(); err != nil {
return err
}
}
return nil
}