yarn: impermanence

etcnixos/hardware_desktop.nix

@@ -1,29 +0,0 @@
-{
-  config,
-  lib,
-  pkgs,
-  modulesPath,
-  ...
-}:
-{
-  fileSystems."/" = {
-    device = "/dev/disk/by-uuid/ff51be5a-b87b-4e6a-9c1d-796ceeaca153";
-    fsType = "ext4";
-  };
-
-  fileSystems."/boot" = {
-    device = "/dev/disk/by-uuid/3D37-E610";
-    fsType = "vfat";
-    options = [
-      "fmask=0022"
-      "dmask=0022"
-    ];
-  };
-
-  fileSystems."/media/games" = {
-    device = "/dev/disk/by-uuid/1878136e-765d-4784-b204-3536ab4fdac8";
-    fsType = "f2fs";
-    options = [ "nofail" ];
-  };
-
-}

etcnixos/impermanence-disk-config.nix

@@ -0,0 +1,52 @@
+{
+  disko.devices = {
+    disk = {
+      main = {
+        type = "disk";
+        content = {
+          type = "gpt";
+          partitions = {
+            ESP = {
+              type = "EF00";
+              size = "500M";
+              content = {
+                type = "filesystem";
+                format = "vfat";
+                mountpoint = "/boot";
+              };
+            };
+            persistent = {
+              size = "100%";
+              content = {
+                type = "filesystem";
+                format = "f2fs";
+                mountpoint = "/persistent";
+              };
+            };
+            nix = {
+              size = "200G";
+              content = {
+                type = "filesystem";
+                format = "f2fs";
+                mountpoint = "/nix";
+              };
+            };
+          };
+        };
+      };
+    };
+    nodev = {
+      "/" = {
+        fsType = "tmpfs";
+        mountOptions = [
+          "defaults"
+          "size=2G"
+          "mode=755"
+        ];
+      };
+    };
+  };
+
+  fileSystems."/persistent".neededForBoot = true;
+  fileSystems."/nix".neededForBoot = true;
+}

etcnixos/impermanence.nix

@@ -0,0 +1,35 @@
+{
+  config,
+  lib,
+  username,
+  ...
+}:
+{
+  environment.persistence."/persistent" = {
+    hideMounts = true;
+    directories = [
+      "/var/log"
+      "/var/lib/systemd/coredump"
+      "/var/lib/nixos"
+      "/var/lib/systemd/timers"
+    ];
+
+    files = [
+      "/etc/ssh/ssh_host_ed25519_key"
+      "/etc/ssh/ssh_host_ed25519_key.pub"
+      "/etc/ssh/ssh_host_rsa_key"
+      "/etc/ssh/ssh_host_rsa_key.pub"
+      "/etc/machine-id"
+    ];
+
+    users.${username} = {
+      directories = [
+        "."
+      ];
+    };
+  };
+
+  systemd.tmpfiles.rules = [
+    "d /etc 755 root"
+  ];
+}

etcnixos/system-yarn.nix

@@ -8,14 +8,23 @@
 }:
 {
   imports = [
+    ./impermanence-disk-config.nix
     ./common.nix
-    ./hardware_desktop.nix
+    ./impermanence.nix
     ./no-rgb.nix
     ./vr.nix
 
     inputs.nixos-hardware.nixosModules.common-cpu-amd-pstate
     inputs.nixos-hardware.nixosModules.common-cpu-amd-zenpower
+    inputs.impermanence.nixosModules.impermanence
+    inputs.disko.nixosModules.disko
   ];
+
+  fileSystems."/media/games" = {
+    device = "/dev/disk/by-uuid/1878136e-765d-4784-b204-3536ab4fdac8";
+    fsType = "f2fs";
+    options = [ "nofail" ];
+  };
   networking.hostId = "abf570f9";
 
   services.openssh = {

flake.lock

@@ -154,6 +154,21 @@
         "type": "github"
       }
     },
+    "impermanence": {
+      "locked": {
+        "lastModified": 1737831083,
+        "narHash": "sha256-LJggUHbpyeDvNagTUrdhe/pRVp4pnS6wVKALS782gRI=",
+        "owner": "nix-community",
+        "repo": "impermanence",
+        "rev": "4b3e914cdf97a5b536a889e939fb2fd2b043a170",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-community",
+        "repo": "impermanence",
+        "type": "github"
+      }
+    },
     "lanzaboote": {
       "inputs": {
         "crane": "crane",
@@ -344,6 +359,7 @@
         "disko": "disko",
         "emacs-overlay": "emacs-overlay",
         "home-manager": "home-manager",
+        "impermanence": "impermanence",
         "lanzaboote": "lanzaboote",
         "niri": "niri",
         "nix-doom-emacs-unstraightened": "nix-doom-emacs-unstraightened",

flake.nix

@@ -52,6 +52,11 @@
       inputs.nixpkgs.follows = "nixpkgs";
       inputs.emacs-overlay.follows = "emacs-overlay";
     };
+
+    impermanence = {
+      url = "github:nix-community/impermanence";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
   };
 
   outputs =