modules.system.fileSystems.rollingRootfs: enable as default

devices/one/default.nix

@@ -17,7 +17,6 @@ inputs:
           luks.auto."/dev/disk/by-partlabel/one-root" = { mapper = "root"; ssd = true; };
           swap = [ "/nix/swap/swap" ];
           resume = { device = "/dev/mapper/root"; offset = 4728064; };
-          rollingRootfs = {};
         };
         nixpkgs.march = "tigerlake";
       };

devices/pc/default.nix

@@ -29,7 +29,6 @@ inputs:
           };
           swap = [ "/dev/mapper/swap" ];
           resume = "/dev/mapper/swap";
-          rollingRootfs = {};
         };
         grub.windowsEntries."08D3-10DE" = "Windows";
         nix.marches =

devices/srv1/default.nix

@@ -16,7 +16,6 @@ inputs:
               { "/nix" = "/nix"; "/nix/rootfs/current" = "/"; };
           };
           swap = [ "/nix/swap/swap" ];
-          rollingRootfs = {};
         };
       };
       hardware.cpus = [ "intel" ];

devices/srv2/default.nix

@@ -18,7 +18,6 @@ inputs:
               { mountPoint = "/nix/remote/pc"; hard = false; };
           };
           swap = [ "/nix/swap/swap" ];
-          rollingRootfs = {};
         };
         nixpkgs.cuda.capabilities =
         [

devices/srv3/default.nix

@@ -15,7 +15,6 @@ inputs:
             btrfs."/dev/mapper/root1" = { "/nix" = "/nix"; "/nix/rootfs/current" = "/"; };
           };
           swap = [ "/dev/mapper/swap" ];
-          rollingRootfs = {};
         };
         nixpkgs.march = "haswell";
         initrd.sshd = {};

devices/test-pc-vm/default.nix

@@ -13,7 +13,6 @@ inputs:
             vfat."/dev/disk/by-partlabel/test-boot" = "/boot";
             btrfs."/dev/disk/by-partlabel/test-root1" = { "/nix" = "/nix"; "/nix/rootfs/current" = "/"; };
           };
-          rollingRootfs = {};
         };
         nixpkgs.march = "znver4";
         network = {};

devices/test-pc/default.nix

@@ -13,7 +13,6 @@ inputs:
             vfat."/dev/disk/by-partlabel/test-boot" = "/boot";
             btrfs."/dev/disk/by-partlabel/test-root1" = { "/nix" = "/nix"; "/nix/rootfs/current" = "/"; };
           };
-          rollingRootfs = {};
         };
         nixpkgs.march = "znver4";
         network = { dhcp = [ "nixvirt" ]; bridge.nixvirt.interfaces = [ "enp1s0" ]; };

devices/test/default.nix

@@ -13,7 +13,6 @@ inputs:
             vfat."/dev/disk/by-partlabel/test-boot" = "/boot";
             btrfs."/dev/disk/by-partlabel/test-root1" = { "/nix" = "/nix"; "/nix/rootfs/current" = "/"; };
           };
-          rollingRootfs = {};
         };
         nixpkgs.march = "haswell";
         network = {};

devices/vps4/default.nix

@@ -17,7 +17,6 @@ inputs:
             };
           };
           swap = [ "/nix/swap/swap" ];
-          rollingRootfs = {};
         };
         grub.installDevice = "/dev/disk/by-path/pci-0000:00:04.0";
         nixpkgs.march = "znver2";

devices/vps6/default.nix

@@ -17,7 +17,6 @@ inputs:
             };
           };
           swap = [ "/nix/swap/swap" ];
-          rollingRootfs = {};
         };
         grub.installDevice = "/dev/disk/by-path/pci-0000:00:05.0-scsi-0:0:0:0";
         nixpkgs.march = "znver2";

modules/system/fileSystems/default.nix

@@ -25,7 +25,7 @@ inputs:
       {
         waitDevices = mkOption { type = types.listOf types.nonEmptyStr; default = []; };
       };});
-      default = null;
+      default = {};
     };
   };
   config = let inherit (inputs.config.nixos.system) fileSystems; in inputs.lib.mkMerge