Function FindTarBinary

pkg/tarutil/tarutil.go:29–57

FindTarBinary returns a path to the tar binary and whether it is GNU tar.

()

// FindTarBinary returns a path to the tar binary and whether it is GNU tar.
func FindTarBinary() (string, bool, error) {
	isGNU := func(exe string) bool {
		v, err := exec.Command(exe, "--version").Output()
		if err != nil {
			log.L.Warnf("Failed to detect whether %q is GNU tar or not", exe)
			return false
		}
		if !strings.Contains(string(v), "GNU tar") {
			log.L.Warnf("%q does not seem GNU tar", exe)
			return false
		}
		return true
	}
	if v := os.Getenv("TAR"); v != "" {
		if exe, err := exec.LookPath(v); err == nil {
			return exe, isGNU(exe), nil
		}
	}
	if exe, err := exec.LookPath("gnutar"); err == nil {
		return exe, true, nil
	}
	if exe, err := exec.LookPath("gtar"); err == nil {
		return exe, true, nil
	}
	if exe, err := exec.LookPath("tar"); err == nil {
		return exe, isGNU(exe), nil
	}
	return "", false, fmt.Errorf("failed to find `tar` binary")
}