stateless rootfs

global/default.nix

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

global/stateless-configuration.nix

@@ -0,0 +1,34 @@
+{
+    # /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"
+        ];
+    };
+
+    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" ];
+    };
+}