nixpkgs/nixos/modules/tasks/bcache.nix

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{ config, lib, pkgs, ... }:
{
options.boot.initrd.services.bcache.enable = (lib.mkEnableOption "bcache support in the initrd") // {
visible = false; # only works with systemd stage 1
};
config = {
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 ];
};
};
}