From c96a8b6b93efcbbb7ab01a81a7ba155be3bdfd2a Mon Sep 17 00:00:00 2001
From: Zoe Roux <zoe.roux@zoriya.dev>
Date: Mon, 6 Mar 2023 13:20:05 +0900
Subject: [PATCH] Try to use impermanence

---
 flake.lock                             | 16 +++++++++++
 flake.nix                              |  4 +++
 hosts/fuhen/hardware-configuration.nix |  6 ++++
 modules/nixos/games/default.nix        |  1 +
 modules/nixos/nix/default.nix          | 39 ++++++++++++++++++++++++--
 modules/nixos/wayland/default.nix      |  2 +-
 6 files changed, 65 insertions(+), 3 deletions(-)

diff --git a/flake.lock b/flake.lock
index 52965d9..9fe2a4f 100644
--- a/flake.lock
+++ b/flake.lock
@@ -129,6 +129,21 @@
         "type": "github"
       }
     },
+    "impermanence": {
+      "locked": {
+        "lastModified": 1675359654,
+        "narHash": "sha256-FPxzuvJkcO49g4zkWLSeuZkln54bLoTtrggZDJBH90I=",
+        "owner": "nix-community",
+        "repo": "impermanence",
+        "rev": "6138eb8e737bffabd4c8fc78ae015d4fd6a7e2fd",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-community",
+        "repo": "impermanence",
+        "type": "github"
+      }
+    },
     "jq": {
       "flake": false,
       "locked": {
@@ -290,6 +305,7 @@
       "inputs": {
         "home-manager": "home-manager",
         "hyprland": "hyprland",
+        "impermanence": "impermanence",
         "jq": "jq",
         "neovim-nightly": "neovim-nightly",
         "nix-colors": "nix-colors",
diff --git a/flake.nix b/flake.nix
index 684fb27..cd99df1 100644
--- a/flake.nix
+++ b/flake.nix
@@ -7,6 +7,10 @@
       url = "github:nix-community/home-manager";
       inputs.nixpkgs.follows = "nixpkgs";
     };
+    impermanence = {
+      url = "github:nix-community/impermanence";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
     hyprland = {
       url = "github:hyprwm/Hyprland/v0.22.0beta";
       inputs.nixpkgs.follows = "nixpkgs";
diff --git a/hosts/fuhen/hardware-configuration.nix b/hosts/fuhen/hardware-configuration.nix
index f2dae96..e1fd876 100644
--- a/hosts/fuhen/hardware-configuration.nix
+++ b/hosts/fuhen/hardware-configuration.nix
@@ -15,6 +15,12 @@
   boot.extraModulePackages = [];
 
   fileSystems."/" = {
+    device = "none";
+    fsType = "tmpfs";
+    options = [ "size=4G" "mode=755" ];
+  };
+
+  fileSystems."/nix" = {
     device = "/dev/disk/by-uuid/e8f1fdc5-c5fc-4468-b92a-63b7b4093345";
     fsType = "ext4";
   };
diff --git a/modules/nixos/games/default.nix b/modules/nixos/games/default.nix
index 55057a1..cb2e258 100644
--- a/modules/nixos/games/default.nix
+++ b/modules/nixos/games/default.nix
@@ -5,6 +5,7 @@ in {
   config = lib.mkIf cfg.enable {
     services.flatpak.enable = true;
 
+    hardware.steam-hardware.enable = true;
     hardware.opengl.driSupport32Bit = true;
     environment.systemPackages = with pkgs; [
       wineWowPackages.stable
diff --git a/modules/nixos/nix/default.nix b/modules/nixos/nix/default.nix
index 0fbf3e8..9864aa9 100644
--- a/modules/nixos/nix/default.nix
+++ b/modules/nixos/nix/default.nix
@@ -1,25 +1,60 @@
 {
   lib,
   config,
+  impermanence,
   ...
 }: let
   cfg = config.nixconf;
 in {
+  imports = [ impermanence.nixosModules.impermanence ];
   options.nixconf = {enable = lib.mkEnableOption "nix";};
   config = lib.mkIf cfg.enable {
+
     nix = {
-      settings.auto-optimise-store = true;
+      settings = {
+        auto-optimise-store = true;
+        warn-dirty = false;
+        experimental-features = ["nix-command" "flakes"];
+      };
       gc = {
         automatic = true;
         dates = "weekly";
         options = "--delete-older-than 14d";
       };
       extraOptions = ''
-        experimental-features = nix-command flakes
         keep-outputs = true
         keep-derivations = true
       '';
     };
     nixpkgs.config.allowUnfree = true;
+
+    environment.persistence."/nix/persist" = {
+      hideMounts = true;
+      directories = [
+        "/var/log"
+        "/var/lib/bluetooth"
+        "/var/lib/nixos"
+        "/var/lib/systemd/coredump"
+        "/var/lib/docker"
+        "/etc/NetworkManager/system-connections"
+      ];
+      files = [
+        "/etc/machine-id"
+      ];
+      users.zoriya = {
+        directories = [
+          "downloads"
+          "stuff"
+          "projects"
+          { directory = ".gnupg"; mode = "0700"; }
+          { directory = ".ssh"; mode = "0700"; }
+          ".local/share/direnv"
+          ".local/share/flatpak"
+          ".local/share/atuin"
+          ".config/google-chrome"
+        ];
+        files = [ ];
+      };
+    };
   };
 }
diff --git a/modules/nixos/wayland/default.nix b/modules/nixos/wayland/default.nix
index 1b7decc..9bfaf93 100644
--- a/modules/nixos/wayland/default.nix
+++ b/modules/nixos/wayland/default.nix
@@ -22,7 +22,7 @@ in {
       alsa.enable = true;
       alsa.support32Bit = true;
       pulse.enable = true;
-      #wireplumber.enable = true;
+      wireplumber.enable = true;
     };
 
     # Autostart hyprland and display lockscreen as greeter