{ lib, ... }:
{
  boot.initrd.postResumeCommands = lib.mkAfter ''
    mkdir /btrfs_tmp
    mount /dev/disk/by-label/BUTTER /btrfs_tmp
    if [[ -e /btrfs_tmp/root ]]; then
        mkdir -p /btrfs_tmp/old_roots
        timestamp=$(date --date="@$(stat -c %Y /btrfs_tmp/root)" "+%Y-%m-%-d_%H:%M:%S")
        mv /btrfs_tmp/root "/btrfs_tmp/old_roots/$timestamp"
    fi

    delete_subvolume_recursively() {
        IFS=$'\n'
        for i in $(btrfs subvolume list -o "$1" | cut -f 9- -d ' '); do
            delete_subvolume_recursively "/btrfs_tmp/$i"
        done
        btrfs subvolume delete "$1"
    }

    for i in $(find /btrfs_tmp/old_roots/ -maxdepth 1 -mtime +1); do
        delete_subvolume_recursively "$i"
    done

    btrfs subvolume create /btrfs_tmp/root
    umount /btrfs_tmp
  '';
  # impermanence
  environment.persistence."/persistent" = {
    enable = true; # NB: Defaults to true, not needed
    hideMounts = true;
    directories = [
      "/var/log"
      "/var/lib/bluetooth"
      "/var/lib/nixos"
      "/var/lib/systemd/coredump"
      "/etc/NetworkManager/system-connections"
      "/etc/nixos"
      "/var/lib/flatpak"
      {
        directory = "/var/lib/colord";
        user = "colord";
        group = "colord";
        mode = "u=rwx,g=rx,o=";
      }
    ];
    files = [
      "/etc/machine-id"
      {
        file = "/var/keys/secret_file";
        parentDirectory = {
          mode = "u=rwx,g=,o=";
        };
      }
    ];
    users.laythe = {
      directories = [
        "Downloads"
        "Music"
        "Pictures"
        "Documents"
        "Videos"
        "nixos-configv3"
        {
          directory = ".local/share/Steam";
          mode = "0777";
        }
        {
          directory = ".local/share/flatpak";
          mode = "0700";
        }
        {
          directory = ".gnupg";
          mode = "0700";
        }
        {
          directory = ".ssh";
          mode = "0700";
        }
        {
          directory = ".nixops";
          mode = "0700";
        }
        {
          directory = ".local/share/keyrings";
          mode = "0700";
        }
        ".local/share/direnv"
      ];
      files = [
        ".screenrc"
      ];
    };
  };
}