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nixpkgs/nixos/modules/tasks/bcache.nix

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Nix

{ config, lib, pkgs, ... }: let
cfg = config.boot.bcache;
in {
options.boot.bcache.enable = lib.mkEnableOption "bcache mount support" // {
default = true;
example = false;
};
options.boot.initrd.services.bcache.enable = lib.mkEnableOption "bcache support in the initrd" // {
description = ''
*This will only be used when systemd is used in stage 1.*
Whether to enable bcache support in the initrd.
'';
default = config.boot.initrd.systemd.enable && config.boot.bcache.enable;
defaultText = lib.literalExpression "config.boot.initrd.systemd.enable && config.boot.bcache.enable";
};
config = lib.mkIf cfg.enable {
environment.systemPackages = [ pkgs.bcache-tools ];
services.udev.packages = [ pkgs.bcache-tools ];
boot.initrd.extraUdevRulesCommands = lib.mkIf (!config.boot.initrd.systemd.enable) ''
cp -v ${pkgs.bcache-tools}/lib/udev/rules.d/*.rules $out/
'';
boot.initrd.services.udev = lib.mkIf config.boot.initrd.services.bcache.enable {
packages = [ pkgs.bcache-tools ];
binPackages = [ pkgs.bcache-tools ];
};
};
}