forked from wal-g/wal-g
/
tar.go
90 lines (79 loc) · 2.35 KB
/
tar.go
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package walg
import (
"archive/tar"
"fmt"
"github.com/pkg/errors"
"io"
"os"
"path"
"path/filepath"
"strings"
)
// TarInterpreter behaves differently
// for different file types.
type TarInterpreter interface {
Interpret(r io.Reader, hdr *tar.Header) error
}
// FileTarInterpreter extracts input to disk.
type FileTarInterpreter struct {
NewDir string
}
// Interpret extracts a tar file to disk and creates needed directories.
// Returns the first error encountered. Calls fsync after each file
// is written successfully.
func (ti *FileTarInterpreter) Interpret(tr io.Reader, cur *tar.Header) error {
targetPath := path.Join(ti.NewDir, cur.Name)
switch cur.Typeflag {
case tar.TypeReg, tar.TypeRegA:
var f *os.File
f, err := os.Create(targetPath)
dne := os.IsNotExist(err)
if dne {
base := filepath.Base(cur.Name)
dir := strings.TrimSuffix(targetPath, base)
err := os.MkdirAll(dir, 0755)
if err != nil {
return errors.Wrap(err, "Interpret: failed to create all directories")
}
f, err = os.Create(targetPath)
if err != nil {
return errors.Wrapf(err, "Interpret: failed to create new file %s", targetPath)
}
}
if err != nil && !dne {
return errors.Wrapf(err, "Interpret: failed to create new file %s", targetPath)
}
_, err = io.Copy(f, tr)
if err != nil {
return errors.Wrap(err, "Interpret: copy failed")
}
mode := os.FileMode(cur.Mode)
if err = os.Chmod(f.Name(), mode); err != nil {
return errors.Wrap(err, "Interpret: chmod failed")
}
if err = f.Sync(); err != nil {
return errors.Wrap(err, "Interpret: fsync failed")
}
if err = f.Close(); err != nil {
return errors.Wrapf(err, "Interpret: failed to close file %s", targetPath)
}
case tar.TypeDir:
err := os.MkdirAll(targetPath, 0755)
if err != nil {
return errors.Wrapf(err, "Interpret: failed to create all directories in %s", targetPath)
}
if err = os.Chmod(targetPath, os.FileMode(cur.Mode)); err != nil {
return errors.Wrap(err, "Interpret: chmod failed")
}
case tar.TypeLink:
if err := os.Link(cur.Name, targetPath); err != nil {
return errors.Wrapf(err, "Interpret: failed to create hardlink %s", targetPath)
}
case tar.TypeSymlink:
if err := os.Symlink(cur.Name, targetPath); err != nil {
return errors.Wrapf(err, "Interpret: failed to create symlink", targetPath)
}
}
fmt.Println(cur.Name)
return nil
}