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{ lib, config, ... }: let
cfg = config.boot._loader;
in {
options.boot._loader = {
enable = lib.mkEnableOption "enable unified bootloader config";
loader = lib.mkOption {
type = lib.types.enum [ "grub" "systemd-boot" ];
default = "systemd-boot";
description = "whether to install grub or systemd-boot as the bootloader";
};
mode = lib.mkOption {
type = lib.types.enum [ "efi" "bios" ];
default = "efi";
description = "whether to install the bootloader in efi or bios mode";
};
grub = {
biosDevice = lib.mkOption {
type = lib.types.str;
description = "device to install grub on";
};
zfsSupport = lib.mkEnableOption "zfs boot device support";
};
memtest86.enable = lib.mkEnableOption "make Memtest86+ available from the bootloader";
};
config = let
usingEfi = cfg.mode == "efi";
usingBios = cfg.mode == "bios";
in lib.mkIf cfg.enable {
assertions = [
{
assertion = cfg.loader != "grub" || !cfg.grub.zfsSupport || usingEfi;
message = "zfsSupport option requires using efi boot mode";
}
];
boot.loader = {
grub = lib.mkIf (cfg.loader == "grub") {
enable = true;
# bios
device = lib.mkIf usingBios cfg.grub.biosDevice;
# efi
efiSupport = usingEfi;
efiInstallAsRemovable = usingEfi;
# zfs
zfsSupport = cfg.grub.zfsSupport;
mirroredBoots = lib.mkIf cfg.grub.zfsSupport [
{ devices = [ "nodev" ]; path = "/boot"; }
];
# misc
enableCryptodisk = true;
memtest86.enable = cfg.memtest86.enable;
};
systemd-boot = lib.mkIf (cfg.loader == "systemd-boot") {
enable = true;
editor = false;
memtest86.enable = cfg.memtest86.enable;
};
efi = lib.mkIf usingEfi {
efiSysMountPoint = lib.mkIf (cfg.loader == "grub") "/boot/efi";
canTouchEfiVariables = true;
};
};
};
}
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