invalid argument error when trying to extract ISO to directory

[smahm006]

I am trying to extract a ubuntu iso image (from https://releases.ubuntu.com/22.04/) to a temporary folder. Below is the code I am using

func ExtractISO() error {
	temp, err := os.MkdirTemp("temp", "ubuntu-")
	if err != nil {
		return fmt.Errorf("creating temp dir: %s", err)
	}
	iso_file, err := os.Open("ubuntu-22.04.3-live-server-amd64.iso")
	if err != nil {
		return fmt.Errorf("opening iso file: %s", err)
	}
	defer iso_file.Close()
	if err = util.ExtractImageToDirectory(iso_file, temp); err != nil {
		return fmt.Errorf("extracting image: %s", err)
	}
	return nil
}

I am getting hit with an error extracting image: open temp/ubuntu-4020240902/boot/grub/i386-pc/zstd.mod: invalid argument

I am not sure what the reason is, maybe the - in i386-pc?

EDIT: I just realized this might also be a permissions issue

[FNDenisovna]

i have analogous problem :(

boot/grub/i386-efi/xnu.mod: invalid argument

[smahm006]

I just ended up using os.Exec to call xorriso

func extractISOToDirectory(filename string, source string, destination string) error {
	xorriso_args := fmt.Sprintf("-osirrox on -indev %s/%s -extract / %s", source, filename, destination)
	cmd := exec.Command("xorriso", strings.Split(xorriso_args, " ")...)
	err := cmd.Run()
	if err != nil {
		return fmt.Errorf("xorriso error: %s", err)
	}
	err = filepath.Walk(destination, func(path string, info os.FileInfo, err error) error {
		if err != nil {
			return err
		}
		return os.Chmod(path, os.FileMode(0755))
	})
	if err != nil {
		return fmt.Errorf("setting directory permissions: %s", err)
	}
	return nil
}

[FNDenisovna]

thank you! i was just thinking this way :)