feat: new system

profiles/common/nixos/default.nix

@@ -25,6 +25,7 @@
     ./login.nix
     ./stylix.nix
     ./power-profiles-daemon.nix
+    ./impermanence.nix
   ];
 
   nix.settings.trusted-users = [ "swarsel" ];

profiles/common/nixos/impermanence.nix

@@ -0,0 +1,87 @@
+{ config, lib, ... }:
+{
+
+  security.sudo.extraConfig = lib.mkIf config.swarselsystems.impermanence ''
+    # rollback results in sudo lectures after each reboot
+    Defaults lecture = never
+  '';
+
+  # This script does the actual wipe of the system
+  # So if it doesn't run, the btrfs system effectively acts like a normal system
+  # Taken from https://github.com/NotAShelf/nyx/blob/2a8273ed3f11a4b4ca027a68405d9eb35eba567b/modules/core/common/system/impermanence/default.nix
+
+  boot.initrd.systemd.services.rollback = lib.mkIf config.swarselsystems.impermanence {
+    description = "Rollback BTRFS root subvolume to a pristine state";
+    wantedBy = [ "initrd.target" ];
+    # make sure it's done after encryption
+    # i.e. LUKS/TPM process
+    after = [ "systemd-cryptsetup@enc.service" ];
+    # mount the root fs before clearing
+    before = [ "sysroot.mount" ];
+    unitConfig.DefaultDependencies = "no";
+    serviceConfig.Type = "oneshot";
+    script = ''
+      mkdir -p /mnt
+
+      # We first mount the btrfs root to /mnt
+      # so we can manipulate btrfs subvolumes.
+      mount -o subvol=/ /dev/mapper/enc /mnt
+      btrfs subvolume list -o /mnt/root
+
+      # While we're tempted to just delete /root and create
+      # a new snapshot from /root-blank, /root is already
+      # populated at this point with a number of subvolumes,
+      # which makes `btrfs subvolume delete` fail.
+      # So, we remove them first.
+      #
+      # /root contains subvolumes:
+      # - /root/var/lib/portables
+      # - /root/var/lib/machines
+
+      btrfs subvolume list -o /mnt/root |
+      cut -f9 -d' ' |
+      while read subvolume; do
+        echo "deleting /$subvolume subvolume..."
+        # btrfs subvolume delete "/mnt/$subvolume"
+      done &&
+      echo "deleting /root subvolume..." &&
+      # btrfs subvolume delete /mnt/root
+
+      echo "restoring blank /root subvolume..."
+      # btrfs subvolume snapshot /mnt/root-blank /mnt/root
+
+      # Once we're done rolling back to a blank snapshot,
+      # we can unmount /mnt and continue on the boot process.
+      umount /mnt
+    '';
+  };
+
+
+  environment.persistence."/persist" = lib.mkIf config.swarselsystems.impermanence {
+    directories =
+      [
+        "/.cache/nix/"
+        "/srv"
+        "/etc/nixos"
+        "/etc/nix"
+        "/etc/NetworkManager/system-connections"
+        "/etc/secureboot"
+        "/var/db/sudo/"
+        "/var/cache/"
+        "/var/lib/"
+      ];
+
+    files = [
+      # important state
+      "/etc/machine-id"
+      # ssh stuff
+      /*
+      "/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"
+      */
+    ];
+  };
+
+}

profiles/common/nixos/users.nix

@@ -1,11 +1,11 @@
-{ pkgs, config, ... }:
+{ pkgs, config, lib, ... }:
 {
   users = {
-    mutableUsers = false;
+    mutableUsers = lib.mkIf (!config.swarselsystems.initialSetup) false;
     users.swarsel = {
       isNormalUser = true;
       description = "Leon S";
-      hashedPasswordFile = config.sops.secrets.swarseluser.path;
+      hashedPasswordFile = lib.mkIf (!config.swarselsystems.initialSetup) config.sops.secrets.swarseluser.path;
       extraGroups = [ "networkmanager" "wheel" "lp" "audio" "video" "vboxusers" "scanner" ];
       packages = with pkgs; [ ];
     };