{ ... }:
{
  flake.modules.nixos.controlstation =
    { pkgs, ... }:
    {

      boot.initrd.systemd.services.rollback = {
        description = "Rollback BTRFS root to blank state";
        wantedBy = [ "initrd.target" ]; 
        after = [ "initrd-root-device.target" ];
        requires = [ "initrd-root-device.target" ];
        before = [ "sysroot.mount" ];
        unitConfig.DefaultDependencies = "no";
        serviceConfig.Type = "oneshot";
        path = with pkgs; [
          coreutils
          util-linux
          btrfs-progs
        ];
        script = ''
          mkdir -p /mnt

          mount -o subvol=/ /dev/disk/by-uuid/9a5d07a2-e1e7-4bb9-be0d-5e9c07231547 /mnt

          btrfs subvolume list -o /mnt/@root |
          cut -f9 -d' ' |
          while read subvolume; do
            echo "deleting /$subvolume subvolume..."
            btrfs subvolume delete "/mnt/$subvolume"
          done &&
          echo "deleting @root subvolume..." &&
          btrfs subvolume delete /mnt/@root

          echo "restoring blank @root subvolume..."
          btrfs subvolume snapshot /mnt/@root-empty /mnt/@root

          umount /mnt
        '';
      };

      fileSystems = {

        "/boot" = {
          device = "/dev/disk/by-uuid/E61F-4154";
          fsType = "vfat";
          options = [
            "fmask=0077"
            "dmask=0077"
          ];
        };

        "/" = {
          device = "/dev/disk/by-uuid/9a5d07a2-e1e7-4bb9-be0d-5e9c07231547";
          fsType = "btrfs";
          options = [
            "subvol=@root"
            "compress=zstd"
            "noatime"
          ];
        };

        "/nix" = {
          device = "/dev/disk/by-uuid/9a5d07a2-e1e7-4bb9-be0d-5e9c07231547";
          fsType = "btrfs";
          options = [
            "subvol=@nix-store"
            "compress=zstd"
            "noatime"
          ];
        };

        "/persist" = {
          device = "/dev/disk/by-uuid/9a5d07a2-e1e7-4bb9-be0d-5e9c07231547";
          fsType = "btrfs";
          options = [
            "subvol=@persist"
            "compress=zstd"
            "noatime"
          ];
          neededForBoot = true;
        };

        "/home/aqua/Games" = {
          device = "/dev/disk/by-uuid/d4ec18c9-83ad-410a-94e3-33a849a730c3";
          fsType = "ext4";
        };
      };
    };
}