updated

slides/slides.md

@@ -64,6 +64,36 @@
 }
 ```
 
-```txt
+```nix
+{...}: {
+  fileSystems."/persist".neededForBoot = true;
+  environment.persistence."/persist" = {
+    hideMounts = true;
+    directories = [
+      {
+        directory = "/etc/nixos";
+        user = "demo";
+        mode = "u=rwx,g=rx,o=rx";
+      }
+      "/var/log"
+      "/var/lib/bluetooth"
+      "/var/lib/nixos"
+      "/var/lib/systemd/coredump"
+      "/etc/NetworkManager/system-connections"
+    ];
+    files = [
+      "/etc/machine-id"
+      {
+        file = "/var/keys/secret_file";
+        parentDirectory = {mode = "u=rwx,g=,o=";};
+      }
+    ];
 
+    users."demo" = {
+      directories = [
+        "this-will-persist"
+      ];
+    };
+  };
+}
 ```