configure nix

common/nix.nix

@@ -8,6 +8,8 @@
     ];
     auto-optimise-store = true;
     experimental-features = [ "nix-command" "flakes" "auto-allocate-uids" "cgroups" "ca-derivations" ];
+    auto-allocate-uids = true;
+    use-cgroups = true;
   };
   nixpkgs.config.allowUnfree = true;
 }

hosts/skipper/rollback.nix

@@ -0,0 +1,27 @@
+{ lib, ... }: {
+  boot.initrd.postDeviceCommands = lib.mkBefore ''
+    mkdir -p /mnt
+    mount -o subvol=/ /dev/vg0/system /mnt
+
+    btrfs subvolume list -o /mnt |
+      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
+
+    echo "deleting /home subvolume..."
+    btrfs subvolume delete /mnt/@home
+
+    echo "restoring blank /home subvolume..."
+    btrfs subvolume snapshot /mnt/@home-blank /mnt/@home
+
+    umount /mnt
+  '';
+}