{
  config,
  lib,
  ...
}:
with lib; let
  cfg = config.system.disks;
  defaultMountOptions = ["compress-force=zstd:15"];
in {
  imports = [ ./impermanence.nix];

  options.system.disks = {
    disk = mkOption {
      type = lib.types.path;
      example = literalExpression "/dev/disk/by-id/ata-WDC_WD10SDRW-11A0XS0_WD-WXP2A901KJN5";
      description = lib.mdDoc "Path to the disk";
    };
  };

  config = {
    disko.devices = {
      disk.main = {
        device = cfg.disk;
        content = {
          type = "btrfs";
          extraArgs = ["-f" "--label nixos"]; # f: Override existing partitions
          subvolumes = {
            "nix" = {
              mountpoint = "/nix";
              mountOptions = defaultMountOptions;
            };
            "persistent-storage" = {
              mountpoint = "/srv";
              mountOptions = defaultMountOptions;
            };
            "persistent-storage@snapshots" = {
              mountpoint = "/srv/.snapshots";
              mountOptions = defaultMountOptions;
            };
            "boot" = {
              mountpoint = "/boot";
              mountOptions = defaultMountOptions;
            };
          };
        };
      };
      nodev = {
        "/" = {
          fsType = "tmpfs";
          mountOptions = ["defaults" "size=2G" "mode=755"];
        };
      };
    };
    fileSystems = {
      "/srv" = {
        neededForBoot = true;
      };
      "/boot" = {
        neededForBoot = true;
      };
    };
  };
}
# vim: ts=2