More nixy setup.

nodes/hosts/nixy/configuration.nix

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+# Edit this configuration file to define what should be installed on
+# your system. Help is available in the configuration.nix(5) man page, on
+# https://search.nixos.org/options and in the NixOS manual (`nixos-help`).
+
+{ config, lib, pkgs, ... }:
+
+{
+  imports =
+    [ # Include the results of the hardware scan.
+      ./hardware-configuration.nix
+      ./impermanence.nix
+      ./programs/streamcontroller.nix
+      ./system/bootloader.nix
+      ./system/environment.nix
+      ./system/filesystems.nix
+      ./system/networking.nix
+    ];
+
+  system.stateVersion = "24.11"; # Did you read the comment?
+}
+

nodes/hosts/nixy/disk-config.nix

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+{
+  disko.devices = {
+    disk = {
+      nvme1n1 = {
+        type = "disk";
+        device = "/dev/nvme1n1";
+        content = {
+          type = "gpt";
+          partitions = {
+            ESP = {
+              label = "boot";
+              name = "ESP";
+              size = "4500M";
+              type = "EF00";
+              content = {
+                type = "filesystem";
+                format = "vfat";
+                mountpoint = "/boot";
+                mountOptions = [ 
+                  "umask=0077" 
+                  "defaults"
+                ];
+              };
+            };
+            luks = {
+              size = "100%";
+              label = "luks";
+              content = {
+                type = "luks";
+                name = "cryptroot";
+                # disable settings.keyFile if you want to use interactive password entry
+                #passwordFile = "/tmp/secret.key"; # Interactive
+                settings = {
+                  allowDiscards = true;
+                  #keyFile = "/tmp/secret.key";
+                };
+                
+                #additionalKeyFiles = [ "/tmp/additionalSecret.key" ];
+                content = {
+                  type = "btrfs";
+                  extraArgs = [ "-L" "nixos" "-f" ];
+                  subvolumes = {
+                    "/root" = {
+                      mountpoint = "/";
+                      mountOptions = [
+                        "subvol=root"
+                        "compress=zstd"
+                        "noatime"
+                      ];
+                    };
+                    "/nix" = {
+                      mountpoint = "/nix";
+                      mountOptions = [
+                        "subvol=nix"
+                        "compress=zstd"
+                        "noatime"
+                      ];
+                    };
+                    "/persist" = {
+                      mountpoint = "/persist";
+                      mountOptions = [
+                        "subvol=persist"
+                        "compress=zstd"
+                        "noatime"
+                      ];
+                    };
+                    "/log" = {
+                      mountpoint = "/var/log";
+                      mountOptions = [
+                        "subvol=log"
+                        "compress=zstd"
+                        "noatime"
+                      ];
+                    };
+                  };
+                };
+              };
+            };
+          };
+        };
+      };
+      nvme0n1 = {
+        type = "disk";
+        device = "/dev/nvme0n1";
+        content = {
+          type = "gpt";
+          partitions = {
+            luks = {
+              size = "100%";
+              label = "lukshome";
+              content = {
+                type = "luks";
+                name = "crypthome";
+                settings = {
+                  allowDiscards = true;
+                  #keyFile = "/tmp/secret.key";
+                };
+
+                content = {
+                  type = "btrfs";
+                  extraArgs = ["-L" "home" "-f"];
+                  subvolumes = {
+                    "/home" = {
+                      mountpoint = "/home";
+                      mountOptions = ["subvol=home" "compress=zstd" "noatime"];
+                    };
+                  };
+                };
+              };
+            };
+          };
+        };
+      };
+    };
+  };
+  fileSystems."/nix/persist".neededForBoot = true;
+  fileSystems."/var/log".neededForBoot = true;
+  fileSystems."/home".neededForBoot = true;
+}

nodes/hosts/nixy/hardware-configuration.nix

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+# 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, ... }:
+
+{
+  imports =
+    [ (modulesPath + "/installer/scan/not-detected.nix")
+    ];
+
+  # 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
+  # with explicit per-interface declarations with `networking.interfaces.<interface>.useDHCP`.
+  networking.useDHCP = lib.mkDefault true;
+  # networking.interfaces.enp8s0.useDHCP = lib.mkDefault true;
+  # networking.interfaces.wlp7s0.useDHCP = lib.mkDefault true;
+
+  nixpkgs.hostPlatform = lib.mkDefault "x86_64-linux";
+  hardware.cpu.amd.updateMicrocode = lib.mkDefault config.hardware.enableRedistributableFirmware;
+}

nodes/hosts/nixy/impermanence.nix

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+{lib, ...}: {
+  #  Reset root subvolume on boot
+  boot.initrd.postResumeCommands = lib.mkAfter ''
+    mkdir /btrfs_tmp
+      mount /dev/disk/by-partlabel/luks /btrfs_tmp # CONFIRM THIS IS CORRECT FROM findmnt
+      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
+  '';
+
+  # Use /persist as the persistence root, matching Disko's mountpoint
+  environment.persistence."/nix/persist" = {
+    hideMounts = true;
+    directories = [
+      "/etc" # System configuration (Keep this here for persistence via bind-mount)
+      "/var/spool" # Mail queues, cron jobs
+      "/srv" # Web server data, etc.
+      "/root"
+    ];
+    files = [
+    ];
+  };
+}

nodes/hosts/nixy/node.nix

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+{
+  os = "nixos";
+  channel = "stable";
+}