os/impermanence: init

flake.lock

@@ -605,6 +605,21 @@
         "type": "github"
       }
     },
+    "impermanence": {
+      "locked": {
+        "lastModified": 1724489415,
+        "narHash": "sha256-ey8vhwY/6XCKoh7fyTn3aIQs7WeYSYtLbYEG87VCzX4=",
+        "owner": "nix-community",
+        "repo": "impermanence",
+        "rev": "c7f5b394397398c023000cf843986ee2571a1fd7",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-community",
+        "repo": "impermanence",
+        "type": "github"
+      }
+    },
     "lix": {
       "flake": false,
       "locked": {
@@ -2683,6 +2698,7 @@
         "home-manager": "home-manager",
         "hyprland": "hyprland",
         "hyprland-plugins": "hyprland-plugins",
+        "impermanence": "impermanence",
         "lix-module": "lix-module",
         "neovim-flake": "neovim-flake",
         "nixpak": "nixpak",

flake.nix

@@ -50,6 +50,8 @@
 
     helix.url = "github:helix-editor/helix";
 
+    impermanence.url = "github:nix-community/impermanence";
+
     neovim-flake = {
       url = "github:notashelf/nvf";
       inputs.nixpkgs.follows = "nixpkgs";

modules/system/os/impermanence/module.nix

@@ -0,0 +1,30 @@
+{
+  inputs,
+  config,
+  lib,
+  ...
+}: let
+  inherit (lib) optionalString mkIf mkForce;
+
+  cfg = config.modules.system.impermanence;
+in {
+  imports = [
+    inputs.impermanence.nixosModules.impermanence
+  ];
+  environment.persistence."/persist" = {
+    directories = [
+      "/etc/nixos"
+      "/etc/nix"
+      "/etc/NetworkManager/system-connections"
+      "/var/db/sudo"
+      "/var/lib/bluetooth"
+      "/var/lib/nixos"
+      "/var/lib/pipewire"
+      "/var/lib/systemd/coredump"
+    ];
+
+    files = [
+      "/etc/machine-id"
+    ];
+  };
+}