nixpkgs/modules/installer/generations-dir/generations-dir.nix

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{pkgs, config, ...}:
###### interface
let
inherit (pkgs.lib) mkOption mkIf;
options = {
boot = {
loader = {
generationsDir = {
enable = mkOption {
default = false;
description = ''
Whether to enable the simple preparation of symlinks to the system
generations in /boot.
'';
};
copyKernels = mkOption {
default = false;
description = "
Whether copy the necessary boot files into /boot, so
/nix/store is not needed by the boot loadear.
";
};
};
};
};
};
in
###### implementation
let
generationsDirBuilder = pkgs.substituteAll {
src = ./generations-dir-builder.sh;
isExecutable = true;
inherit (pkgs) bash;
path = [pkgs.coreutils pkgs.gnused pkgs.gnugrep];
inherit (config.boot.loader.generationsDir) copyKernels;
};
in
{
require = [
options
# config.system.build
# ../system/system-options.nix
];
system = mkIf config.boot.loader.generationsDir.enable {
build = {
menuBuilder = generationsDirBuilder;
};
boot.loader.id = "generationsDir";
boot.loader.kernelFile = "uImage";
};
}