nix-config/modules/hosts/sirius/disko.nix

{inputs, ...}: {
  flake.modules.nixos.sirius = {
    config,
    lib,
    ...
  }: let
    hasOptinPersistence = config.tnix.boot.impermanence.enable;
  in {
    imports = [
      inputs.disko.nixosModules.disko
    ];

    disko.devices.disk.primary = {
      device = "/dev/nvme1n1";
      type = "disk";
      content = {
        type = "gpt";
        partitions = {
          ESP = {
            size = "1G";
            type = "EF00";
            content = {
              type = "filesystem";
              format = "vfat";
              mountpoint = "/boot";
              mountOptions = [
                "defaults"
                "umask=0077"
              ];
            };
          };
          swap = {
            size = "70G";
            content = {
              type = "swap";
              discardPolicy = "both";
              resumeDevice = true;
            };
          };
          root = {
            size = "100%";
            type = "8300";
            content = {
              type = "btrfs";
              # Base subvolumes that always exist
              subvolumes =
                {
                  "/root" = {
                    mountOptions = [
                      "compress=zstd"
                      "noatime"
                      "space_cache=v2"
                    ];
                    mountpoint = "/";
                  };
                  "/nix" = {
                    mountOptions = [
                      "compress=zstd"
                      "noatime"
                      "noacl"
                      "space_cache=v2"
                    ];
                    mountpoint = "/nix";
                  };
                }
                # Conditionally merge /persist only when impermanence is enabled
                // lib.optionalAttrs hasOptinPersistence {
                  "/persist" = {
                    mountOptions = [
                      "compress=zstd"
                      "noatime"
                      "space_cache=v2"
                    ];
                    mountpoint = "/persist";
                  };
                };
            };
          };
        };
      };
    };
  };
}