image.Load tries using system xz binary

[navidpaya]

Is your feature request related to a problem? Please describe.

I have this code to use kexec to install the latest version of my image on machines that are outdated.

func loadImage(image *boot.LinuxImage, verbose bool) error {
	err := image.Load(boot.WithVerbose(verbose))
	if err != nil {
		log.Printf("Failed to load kernel: %v. Retrying with LoadSyscall=true.", err)
		image.LoadSyscall = true
		err = image.Load(boot.WithVerbose(verbose))
	}
	if err != nil {
		return fmt.Errorf("Kexec load of %v failed: %v", image.Label(), err)
	}
	return nil
}

The reason I have the Load bit twice is that some of the machines have a kernel that's compiled without the CONFIG_KEXEC_FILE flag.

I'm hitting this error on some machines:

Failed to load image: Kexec load of Installer failed: parsing bzImage Linux kernel: error decompressing payload: error starting decompressor: exec: "unxz": executable file not found in $PATH

Is there a way to bundle the needed libraries into u-root itself instead of relying on the machine having this binary?

Describe the solution you'd like
The needed libraries would be bundled into u-root so that it doesn't have to shell out to the system.