forked from kluctl/go-embed-python
/
tar.go
140 lines (127 loc) · 2.81 KB
/
tar.go
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package internal
import (
"archive/tar"
"fmt"
securejoin "github.com/cyphar/filepath-securejoin"
"io"
"io/fs"
"os"
"path/filepath"
)
func ExtractTarStream(r io.Reader, targetPath string) error {
tarReader := tar.NewReader(r)
for true {
header, err := tarReader.Next()
if err == io.EOF {
break
}
if err != nil {
return fmt.Errorf("ExtractTarStream: Next() failed: %w", err)
}
header.Name = filepath.FromSlash(header.Name)
p, err := securejoin.SecureJoin(targetPath, header.Name)
if err != nil {
return err
}
err = os.MkdirAll(filepath.Dir(p), 0755)
if err != nil {
return err
}
switch header.Typeflag {
case tar.TypeDir:
if err := os.MkdirAll(p, 0755); err != nil {
return fmt.Errorf("ExtractTarStream: Mkdir() failed: %w", err)
}
case tar.TypeReg:
outFile, err := os.Create(p)
if err != nil {
return fmt.Errorf("ExtractTarStream: Create() failed: %w", err)
}
_, err = io.Copy(outFile, tarReader)
_ = outFile.Close()
if err != nil {
return fmt.Errorf("ExtractTarStream: Copy() failed: %w", err)
}
err = os.Chmod(p, header.FileInfo().Mode())
if err != nil {
return fmt.Errorf("ExtractTarStream: Chmod() failed: %w", err)
}
err = os.Chtimes(p, header.AccessTime, header.ModTime)
if err != nil {
return err
}
case tar.TypeSymlink:
if err := os.Symlink(header.Linkname, p); err != nil {
return fmt.Errorf("ExtractTarStream: Symlink() failed: %w", err)
}
default:
return fmt.Errorf("ExtractTarStream: uknown type %v in %v", header.Typeflag, header.Name)
}
}
return nil
}
func AddToTar(tw *tar.Writer, pth string, name string, filter func(h *tar.Header, size int64) (*tar.Header, error)) error {
fi, err := os.Lstat(pth)
if err != nil {
return err
}
var linkName string
if fi.Mode().Type() == fs.ModeSymlink {
x, err := os.Readlink(pth)
if err != nil {
return err
}
linkName = x
}
h, err := tar.FileInfoHeader(fi, linkName)
if err != nil {
return err
}
h.Name = filepath.ToSlash(name)
if filter != nil {
s := fi.Size()
if fi.IsDir() {
s = 0
}
h, err = filter(h, s)
if err != nil {
return err
}
if h == nil {
return nil
}
}
err = tw.WriteHeader(h)
if err != nil {
return err
}
if fi.Mode().Type() == fs.ModeSymlink {
return nil
}
if fi.Mode().IsDir() {
des, err := os.ReadDir(pth)
if err != nil {
return err
}
for _, d := range des {
err = AddToTar(tw, filepath.Join(pth, d.Name()), filepath.Join(name, d.Name()), filter)
if err != nil {
return err
}
}
return nil
} else if fi.Mode().IsRegular() {
f, err := os.Open(pth)
if err != nil {
return err
}
defer f.Close()
_, err = io.Copy(tw, f)
if err != nil {
return err
}
return nil
} else {
return fmt.Errorf("unsupported file type/mode %s", fi.Mode().String())
}
}