From 7d0b7575657aabdf58307e7e6c0cc037d2c14147 Mon Sep 17 00:00:00 2001
From: Caroline Larimore <caroline@larimo.re>
Date: Tue, 4 Feb 2025 22:15:16 -0800
Subject: migration: root impermanence

---
 snowfall/modules/nixos/system/default.nix | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

(limited to 'snowfall/modules')

diff --git a/snowfall/modules/nixos/system/default.nix b/snowfall/modules/nixos/system/default.nix
index 9fa3902..dc790bd 100644
--- a/snowfall/modules/nixos/system/default.nix
+++ b/snowfall/modules/nixos/system/default.nix
@@ -12,10 +12,30 @@ in {
       default = null;
       type = nullOr str;
     };
+
+    impermanent = mkEnableOption "root impermanence";
   };
 
   config = {
     networking.hostName = cfg.hostname;
     networking.hostId = cfg.id;
+
+    environment = mkIf cfg.impermanent {
+      persistence."/persist/system" = {
+        hideMounts = true;
+
+        directories = [
+          "/etc/nixos"
+          "/var/log"
+          "/var/lib/nixos"
+          "/var/lib/systemd/coredump"
+          # "/var/lib/bluetooth"
+        ];
+        
+        files = [
+          "/etc/machine-id"
+        ];
+      };
+    };
   };
 }
-- 
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