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External Bootloader Backends
NixOS has support for several bootloader backends by default: systemd-boot, grub, uboot, etc. The built-in bootloader backend support is generic and supports most use cases. Some users may prefer to create advanced workflows around managing the bootloader and bootable entries.
You can replace the built-in bootloader support with your own tooling using the "external" bootloader option.
Imagine you have created a new package called FooBoot.
FooBoot provides a program at ${pkgs.fooboot}/bin/fooboot-install which takes the system closure's path as its only argument and configures the system's bootloader.
You can enable FooBoot like this:
{ pkgs, ... }:
{
boot.loader.external = {
enable = true;
installHook = "${pkgs.fooboot}/bin/fooboot-install";
};
}
Developing Custom Bootloader Backends
Bootloaders should use RFC-0125's Bootspec format and synthesis tools to identify the key properties for bootable system generations.