lets try it out i001 bcache

hosts/i001/flake.nix

@@ -8,7 +8,7 @@
     de_plasma.url = "git+https://git.joshuabell.xyz/ringofstorms/dotfiles?dir=flakes/de_plasma";
     ros_neovim.url = "git+https://git.joshuabell.xyz/ringofstorms/nvim";
 
-    impermanence.url = "github:nix-community/impermanence";
+    # impermanence.url = "github:nix-community/impermanence";
   };
 
   outputs =
@@ -20,6 +20,7 @@
       system = "x86_64-linux";
       primaryUser = "luser";
       configLocation = "/home/${primaryUser}/.config/nixos-config/hosts/${configurationName}";
+      stateAndHomeVersion = "25.11";
       lib = inputs.nixpkgs.lib;
     in
     {
@@ -31,7 +32,7 @@
               inherit inputs;
             };
             modules = [
-              inputs.impermanence.nixosModules.impermanence
+              # inputs.impermanence.nixosModules.impermanence
               inputs.home-manager.nixosModules.default
 
               inputs.ros_neovim.nixosModules.default
@@ -61,7 +62,8 @@
               inputs.common.nixosModules.zsh
 
               ./hardware-configuration.nix
-              ./impermanence.nix
+              ./hardware-mounts.nix
+              # ./impermanence.nix
               (
                 {
                   config,
@@ -70,7 +72,7 @@
                   ...
                 }:
                 rec {
-                  system.stateVersion = "25.05";
+                  system.stateVersion = stateAndHomeVersion;
                   # TODO allowing password auth for now
                   services.openssh.settings.PasswordAuthentication = lib.mkForce true;
 
@@ -81,7 +83,7 @@
                     backupFileExtension = "bak";
                     # add all normal users to home manager so it applies to them
                     users = lib.mapAttrs (name: user: {
-                      home.stateVersion = "25.05";
+                      home.stateVersion = stateAndHomeVersion;
                       programs.home-manager.enable = true;
                     }) (lib.filterAttrs (name: user: user.isNormalUser or false) users.users);
 
@@ -106,10 +108,11 @@
                   networking.hostName = configurationName;
                   programs.nh.flake = configLocation;
                   nixpkgs.config.allowUnfree = true;
-                  users.mutableUsers = false;
+                  # users.mutableUsers = false;
                   users.users = {
                     "${primaryUser}" = {
                       isNormalUser = true;
+                      # hashedPassword = ""; # Use if mutable users is false above
                       initialHashedPassword = "$y$j9T$v1QhXiZMRY1pFkPmkLkdp0$451GvQt.XFU2qCAi4EQNd1BEqjM/CH6awU8gjcULps6"; # "test" password
                       extraGroups = [
                         "wheel"

hosts/i001/hardware-configuration.nix

@@ -1,111 +1,33 @@
 # Do not modify this file!  It was generated by ‘nixos-generate-config’
 # and may be overwritten by future invocations.  Please make changes
 # to /etc/nixos/configuration.nix instead.
-{ config, lib, pkgs, modulesPath, ... }:
-let
-  NIXBOOT = "/dev/disk/by-uuid/641A-6BDB";
-  NIXROOT ="/dev/disk/by-uuid/ae94db42-ec46-4e2f-a98a-118359428a68"; 
-  cryptroot = "/dev/disk/by-uuid/49f11bf1-d4b7-4188-9203-4d7a42569afa";
-
-  USB_KEY = "/dev/disk/by-uuid/9985-EBD1";
-in
 {
-  imports =
+  config,
-    [ (modulesPath + "/installer/scan/not-detected.nix")
+  lib,
-    ];
+  pkgs,
+  modulesPath,
+  ...
+}:
 
-  boot.initrd.availableKernelModules = [ "xhci_pci" "ahci" "usb_storage" "usbhid" "sd_mod" "sdhci_pci" "ehci_pci" "uas" ];
+{
+  imports = [
+    (modulesPath + "/installer/scan/not-detected.nix")
+  ];
+
+  boot.initrd.availableKernelModules = [
+    "xhci_pci"
+    "ahci"
+    "usb_storage"
+    "usbhid"
+    "sd_mod"
+    "sdhci_pci"
+    "ehci_pci"
+    "uas"
+  ];
   boot.initrd.kernelModules = [ ];
   boot.kernelModules = [ "kvm-intel" ];
   boot.extraModulePackages = [ ];
 
-  fileSystems."/boot" =
-    { device = NIXBOOT;
-      fsType = "vfat";
-      options = [ "fmask=0077" "dmask=0077" ];
-    };
-
-  boot.initrd.luks.devices."cryptroot" = {
-    device = NIXROOT;
-
-    # Auto decrypt
-    keyFile = USB_KEY;
-    keyFileSize = 5000;
-    keyFileOffset = 5443;
-
-    tryEmptyPassphrase = true;
-    fallbackToPassword = true;
-    crypttabExtraOpts = [ "tries=2" ];
-  };
-
-  fileSystems."/" =
-    { device = cryptroot;
-      fsType = "btrfs";
-      options = [ "subvol=@root" "compress=zstd" ];
-    };
-
-  fileSystems."/nix" =
-    { device = cryptroot;
-      fsType = "btrfs";
-      options = [ "subvol=@nix" "compress=zstd" "noatime" ];
-    };
-
-  fileSystems."/persist" =
-    { device = cryptroot;
-      neededForBoot = true;
-      fsType = "btrfs";
-      options = [ "subvol=@persist" "compress=zstd" ];
-    };
-
-  fileSystems."/.swap" =
-    { device = cryptroot;
-      fsType = "btrfs";
-      options = [ "subvol=@swap" "noatime" ];
-    };
-
-  fileSystems."/.snapshots" =
-    { device = cryptroot;
-      fsType = "btrfs";
-      options = [ "subvol=@snapshots" "compress=zstd" "noatime"];
-    };
-
-  services.btrfs.autoScrub = {
-    enable = true;
-    # syntax as defined by https://www.freedesktop.org/software/systemd/man/systemd.time.html#Calendar%20Event s
-    interval = "monthly";
-    fileSystems = ["/"];
-  };
-
-  swapDevices = [{
-    device = "/.swap/swapfile"; 
-    size = 8*1024; # Creates an 8GB swap file 
-  }];
-
-  boot.initrd.postResumeCommands = lib.mkAfter ''
-    mkdir /btrfs_tmp
-    mount ${cryptroot} /btrfs_tmp
-    if [[ -e /btrfs_tmp/@root ]]; then
-        mkdir -p /btrfs_tmp/old_roots
-        timestamp=$(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 $(find /btrfs_tmp/old_roots/ -maxdepth 1 -mtime +30); do
-        delete_subvolume_recursively "$i"
-    done
-
-    btrfs subvolume create /btrfs_tmp/@root
-    umount /btrfs_tmp
-  '';
-
   # Enables DHCP on each ethernet and wireless interface. In case of scripted networking
   # (the default) this is the recommended approach. When using systemd-networkd it's
   # still possible to use this option, but it's recommended to use it in conjunction

hosts/i001/hardware-mounts.nix

@@ -0,0 +1,68 @@
+{ ... }:
+let
+  BOOT = "/dev/disk/by-uuid/6E40-637E";
+  PRIMARY = "/dev/disk/by-uuid/ec589da0-4deb-44a3-abcb-9a7016d84519";
+
+  USB_KEY = "/dev/disk/by-uuid/9985-EBD1";
+in
+{
+  # BOOT
+  fileSystems."/boot" = {
+    device = BOOT;
+    fsType = "vfat";
+  };
+
+  # PRIMARY unencrypt
+  # TODO how to auto unencrypt with options...
+  # - USB key
+  # - TPM
+
+  # PRIMARY
+  fileSystems."/" = {
+    device = PRIMARY;
+    fsType = "bcachefs";
+    options = [
+      "X-mount.subdir=@root"
+    ];
+  };
+  fileSystems."/nix" = {
+    device = PRIMARY;
+    fsType = "bcachefs";
+    options = [
+      "X-mount.subdir=@nix"
+      "relatime"
+    ];
+  };
+  fileSystems."/.swap" = {
+    device = PRIMARY;
+    fsType = "bcachefs";
+    options = [
+      "X-mount.subdir=@swap"
+      "noatime"
+    ];
+  };
+  fileSystems."/.snapshots" = {
+    device = PRIMARY;
+    fsType = "bcachefs";
+    options = [
+      "X-mount.subdir=@root"
+      "relatime"
+    ];
+  };
+  # (optional) for preservation/impermanence
+  fileSystems."/persist" = {
+    device = PRIMARY;
+    fsType = "bcachefs";
+    options = [
+      "X-mount.subdir=@persist"
+    ];
+  };
+
+  # SWAP
+  swapDevices = [
+    {
+      device = "/.swap/swapfile";
+      size = 8 * 1024; # Creates an 8GB swap file
+    }
+  ];
+}

hosts/i001/impermanence.nix

@@ -14,6 +14,8 @@
 
       "/etc/NetworkManager/system-connections"
       "/var/lib/bluetooth"
+      "/var/lib/NetworkManager"
+      "/var/lib/iwd"
       "/var/lib/fail2ban"
     ];
     files = [
@@ -34,7 +36,6 @@
 
         # KDE
         ".config/kdeconnect"
-        ".local/kwalletd" # TODO remove? I disabled it so we can try removing something here
 
         # Chrome
         ".config/google-chrome"