stateless

flake.lock

@@ -1,5 +1,20 @@
 {
   "nodes": {
+    "impermanence": {
+      "locked": {
+        "lastModified": 1684264534,
+        "narHash": "sha256-K0zr+ry3FwIo3rN2U/VWAkCJSgBslBisvfRIPwMbuCQ=",
+        "owner": "nix-community",
+        "repo": "impermanence",
+        "rev": "89253fb1518063556edd5e54509c30ac3089d5e6",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-community",
+        "repo": "impermanence",
+        "type": "github"
+      }
+    },
     "nixpkgs": {
       "locked": {
         "lastModified": 1689605451,
@@ -17,6 +32,7 @@
     },
     "root": {
       "inputs": {
+        "impermanence": "impermanence",
         "nixpkgs": "nixpkgs"
       }
     }

flake.nix

@@ -23,9 +23,10 @@
 
   inputs = {
     nixpkgs.url = "nixpkgs/nixos-23.05";
+    impermanence.url = "github:nix-community/impermanence";
   };
 
-  outputs = { self, nixpkgs, ... }: {
+  outputs = { self, nixpkgs, impermanence, ... }: {
     nixosConfigurations.default = nixpkgs.lib.nixosSystem rec {
       system = "aarch64-linux";
 
@@ -38,6 +39,7 @@
 
       modules = [
         ./configuration.nix
+        impermanence.nixosModules.impermanence
       ];
     };
   };

global/default.nix

@@ -4,5 +4,6 @@
     ./software-configuration.nix
     ./user-configuration.nix
     ./containers.nix
+    ./stateless-configuration.nix
   ];
 }

global/stateless-configuration.nix

@@ -0,0 +1,57 @@
+{
+  # /nix/persistent 是你实际保存文件的地方
+  environment.persistence."/nix/persistent" = {
+    # 不让这些映射的 mount 出现在文件管理器的侧边栏中
+    hideMounts = true;
+
+    # 你要映射的文件夹
+    directories = [
+      # "/etc/NetworkManager/system-connections"
+      "/root"
+      "/var"
+      "/home"
+      "/boot"
+    ];
+
+    files = [
+      "/etc/machine-id"
+      "/etc/ssh/ssh_host_ed25519_key.pub"
+      "/etc/ssh/ssh_host_ed25519_key"
+      "/etc/ssh/ssh_host_rsa_key.pub"
+      "/etc/ssh/ssh_host_rsa_key"
+      "/swapfile"
+    ];
+
+    users.pi = {
+      directories = [
+        # 配置文件夹
+        ".cache"
+        ".config"
+        ".gnupg"
+        ".local"
+        ".ssh"
+      ];
+      files = [ ];
+    };
+  };
+
+  environment.variables.NIX_REMOTE = "daemon";
+
+  systemd.services.nix-daemon = {
+    environment = {
+      # 指定临时文件的位置
+      TMPDIR = "/var/cache/nix";
+    };
+    serviceConfig = {
+      # 在 Nix Daemon 启动时自动创建 /var/cache/nix
+      CacheDirectory = "nix";
+    };
+  };
+
+  # Stateless rootfs
+  fileSystems."/" = {
+    device = "tmpfs";
+    fsType = "tmpfs";
+    options = [ "relatime" "mode=755" "nosuid" "nodev" ];
+  };
+}

hardware-configuration.nix

@@ -12,11 +12,9 @@
   boot.initrd.kernelModules = [ ];
   boot.kernelModules = [ ];
   boot.extraModulePackages = [ ];
-  boot.loader.grub.devices = [
+  boot.loader.grub.devices = [ "nodev" ];
-    "nodev"
-  ];
 
-  fileSystems."/" = {
+  fileSystems."/nix" = {
     device = "/dev/disk/by-uuid/44444444-4444-4444-8888-888888888888";
     fsType = "ext4";
   };