func extract()

in scripts/pusher/main.go [177:233]
46 lines of code
12 McCabe index (conditional complexity)

func extract(archive string) (dir string, err error) {
	f, err := os.Open(archive)
	if err != nil {
		return "", err
	}

	tempDir, err := os.MkdirTemp("", "tar-extract-")
	if err != nil {
		return "", err
	}
	defer func() {
		if err != nil {
			os.RemoveAll(tempDir)
		}
	}()

	tarReader := tar.NewReader(f)

	for {
		hdr, err := tarReader.Next()
		if err == io.EOF {
			break
		}
		if err != nil {
			return "", err
		}

		// ignore non-files, they're not found in oci-layout
		if hdr.Typeflag != tar.TypeReg {
			continue
		}

		if err := func() error {
			targetPath := filepath.Join(tempDir, hdr.Name)

			if err := os.MkdirAll(filepath.Dir(targetPath), 0755); err != nil {
				return err
			}

			file, err := os.Create(targetPath)
			if err != nil {
				return err
			}
			defer file.Close()

			if _, err := io.Copy(file, tarReader); err != nil {
				return err
			}

			return file.Close()
		}(); err != nil {
			return "", err
		}
	}

	return tempDir, nil
}