nixpkgs/modules/installer/grub/grub.nix

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{ config, pkgs, ... }:
with pkgs.lib;
let
grubMenuBuilder = pkgs.substituteAll {
src = ./grub-menu-builder.sh;
isExecutable = true;
inherit (pkgs) bash;
path = [pkgs.coreutils pkgs.gnused pkgs.gnugrep];
inherit (config.boot.loader.grub) copyKernels extraEntries extraEntriesBeforeNixOS
splashImage bootDevice configurationLimit;
};
in
{
###### interface
options = {
boot.loader.grub = {
enable = mkOption {
default = true;
description = ''
Whether to enable the GRUB boot loader.
'';
};
device = mkOption {
default = "";
example = "/dev/hda";
description = "
The device on which the boot loader, Grub, will be installed.
If empty, Grub won't be installed and it's your responsibility
to make the system bootable.
";
};
bootDevice = mkOption {
default = "";
example = "(hd0,0)";
description = "
If the system partition may be wiped on reinstall, it is better
to have /boot on a small partition. To do it, we need to explain
to GRUB where the kernels live. Specify the partition here (in
GRUB notation).
";
};
configurationName = mkOption {
default = "";
example = "Stable 2.6.21";
description = "
Grub entry name instead of default.
";
};
extraEntries = mkOption {
default = "";
example = "
title Windows
chainloader (hd0,1)+1
";
description = "
Any additional entries you want added to the Grub boot menu.
";
};
extraEntriesBeforeNixOS = mkOption {
default = false;
description = "
Whether extraEntries are included before the default option.
";
};
splashImage = mkOption {
default = pkgs.fetchurl {
url = http://www.gnome-look.org/CONTENT/content-files/36909-soft-tux.xpm.gz;
sha256 = "14kqdx2lfqvh40h6fjjzqgff1mwk74dmbjvmqphi6azzra7z8d59";
};
example = null;
description = "
Background image used for Grub. It must be a 640x480,
14-colour image in XPM format, optionally compressed with
<command>gzip</command> or <command>bzip2</command>. Set to
<literal>null</literal> to run Grub in text mode.
";
};
configurationLimit = mkOption {
default = 100;
example = 120;
description = "
Maximum of configurations in boot menu. GRUB has problems when
there are too many entries.
";
};
copyKernels = mkOption {
default = false;
description = "
Whether the Grub menu builder should copy kernels and initial
ramdisks to /boot. This is necessary when /nix is on a
different file system than /boot.
";
};
};
};
###### implementation
config = mkIf config.boot.loader.grub.enable {
system.build.menuBuilder = grubMenuBuilder;
# Common attribute for boot loaders so only one of them can be
# set at once.
system.boot.loader.id = "grub";
system.boot.loader.kernelFile = "vmlinuz";
environment.systemPackages = mkIf config.boot.loader.grub.enable [ pkgs.grub ];
# and many other things that have to be moved inside this file.
};
}