Merge pull request #270611 from astro/systemd-netboot

      };

    fileSystems."/nix/store" = mkImageMediaOverride

      { fsType = "overlay";

        device = "overlay";

        options = [

          "lowerdir=/nix/.ro-store"

          "upperdir=/nix/.rw-store/store"

          "workdir=/nix/.rw-store/work"

        ];

        depends = [

          "/nix/.ro-store"

          "/nix/.rw-store/store"

          "/nix/.rw-store/work"

        ];

      { overlay = {

          lowerdir = [ "/nix/.ro-store" ];

          upperdir = "/nix/.rw-store/store";

          workdir = "/nix/.rw-store/work";

        };

        neededForBoot = true;

      };

    boot.initrd.availableKernelModules = [ "squashfs" "overlay" ];