160 lines
3.1 KiB
Go
160 lines
3.1 KiB
Go
package archive
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import (
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"archive/tar"
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"compress/gzip"
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"crypto/sha256"
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"encoding/hex"
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"fmt"
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"io"
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"os"
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"path/filepath"
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"strings"
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)
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// CreateTarGz archives sourceDir into outputPath and returns checksum and size.
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func CreateTarGz(sourceDir, outputPath string) (sha256sum string, size int64, err error) {
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sourceDir = filepath.Clean(sourceDir)
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info, err := os.Stat(sourceDir)
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if err != nil {
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return "", 0, err
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}
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if !info.IsDir() {
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return "", 0, fmt.Errorf("source is not a directory")
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}
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if err := os.MkdirAll(filepath.Dir(outputPath), 0o755); err != nil {
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return "", 0, err
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}
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file, err := os.Create(outputPath)
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if err != nil {
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return "", 0, err
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}
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defer file.Close()
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hasher := sha256.New()
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writer := io.MultiWriter(file, hasher)
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gzipWriter := gzip.NewWriter(writer)
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tarWriter := tar.NewWriter(gzipWriter)
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err = filepath.Walk(sourceDir, func(path string, entry os.FileInfo, walkErr error) error {
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if walkErr != nil {
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return walkErr
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}
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rel, err := filepath.Rel(sourceDir, path)
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if err != nil {
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return err
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}
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if rel == "." {
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return nil
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}
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rel = filepath.ToSlash(rel)
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header, err := tar.FileInfoHeader(entry, "")
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if err != nil {
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return err
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}
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header.Name = rel
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if err := tarWriter.WriteHeader(header); err != nil {
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return err
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}
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if entry.IsDir() {
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return nil
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}
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sourceFile, err := os.Open(path)
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if err != nil {
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return err
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}
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defer sourceFile.Close()
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_, err = io.Copy(tarWriter, sourceFile)
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return err
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})
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if err != nil {
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return "", 0, err
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}
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if err := tarWriter.Close(); err != nil {
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return "", 0, err
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}
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if err := gzipWriter.Close(); err != nil {
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return "", 0, err
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}
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stat, err := file.Stat()
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if err != nil {
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return "", 0, err
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}
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return hex.EncodeToString(hasher.Sum(nil)), stat.Size(), nil
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}
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// ExtractTarGz extracts archivePath into destDir.
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func ExtractTarGz(archivePath, destDir string) error {
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destDir = filepath.Clean(destDir)
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if err := os.MkdirAll(destDir, 0o755); err != nil {
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return err
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}
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file, err := os.Open(archivePath)
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if err != nil {
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return err
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}
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defer file.Close()
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gzipReader, err := gzip.NewReader(file)
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if err != nil {
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return err
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}
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defer gzipReader.Close()
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tarReader := tar.NewReader(gzipReader)
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for {
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header, err := tarReader.Next()
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if err == io.EOF {
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break
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}
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if err != nil {
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return err
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}
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target := filepath.Join(destDir, filepath.FromSlash(header.Name))
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if !strings.HasPrefix(filepath.Clean(target), destDir+string(os.PathSeparator)) && filepath.Clean(target) != destDir {
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return fmt.Errorf("archive entry escapes destination: %s", header.Name)
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}
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switch header.Typeflag {
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case tar.TypeDir:
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if err := os.MkdirAll(target, 0o755); err != nil {
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return err
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}
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case tar.TypeReg:
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if err := os.MkdirAll(filepath.Dir(target), 0o755); err != nil {
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return err
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}
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out, err := os.OpenFile(target, os.O_CREATE|os.O_WRONLY|os.O_TRUNC, os.FileMode(header.Mode))
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if err != nil {
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return err
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}
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if _, err := io.Copy(out, tarReader); err != nil {
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out.Close()
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return err
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}
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out.Close()
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default:
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continue
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}
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}
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return nil
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}
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