From cba7b6b8335797137b387e08fa7ac955cb5692b2 Mon Sep 17 00:00:00 2001
From: andromeda <andromeda@lenovo>
Date: Tue, 30 Dec 2025 01:40:54 +0100
Subject: [PATCH 1/3] change machine specification

---
 flake.nix                                                     | 4 ++--
 .../laptop/hardware-configuration.nix                         | 2 +-
 machines/{laptop.nix => laptop/machine.nix}                   | 1 +
 3 files changed, 4 insertions(+), 3 deletions(-)
 rename hardware-configuration.nix => machines/laptop/hardware-configuration.nix (95%)
 rename machines/{laptop.nix => laptop/machine.nix} (59%)

diff --git a/flake.nix b/flake.nix
index dad3a4f..f71dc4e 100644
--- a/flake.nix
+++ b/flake.nix
@@ -33,7 +33,7 @@
     stylix,
     ...
   }: let
-    laptop = import ./machines/laptop.nix;
+    laptop = import ./machines/laptop/machine.nix;
   in {
     nixosConfigurations.${laptop.hostname} = nixpkgs.lib.nixosSystem {
       system = laptop.system;
@@ -66,7 +66,7 @@
         impermanence.nixosModules.impermanence
         noshell.nixosModules.default
         ./configuration.nix
-        ./hardware-configuration.nix
+        laptop.hardware-configuration
       ];
     };
   };
diff --git a/hardware-configuration.nix b/machines/laptop/hardware-configuration.nix
similarity index 95%
rename from hardware-configuration.nix
rename to machines/laptop/hardware-configuration.nix
index 2c0a93f..e0a98d9 100644
--- a/hardware-configuration.nix
+++ b/machines/laptop/hardware-configuration.nix
@@ -20,7 +20,7 @@
   fileSystems."/" = {
     device = "none";
     fsType = "tmpfs";
-    options = ["defaults" "size=25%" "mode=755"];
+    options = ["defaults" "size=60%" "mode=755"];
   };
 
   fileSystems."/nix" = {
diff --git a/machines/laptop.nix b/machines/laptop/machine.nix
similarity index 59%
rename from machines/laptop.nix
rename to machines/laptop/machine.nix
index c70deb9..d6b1e01 100644
--- a/machines/laptop.nix
+++ b/machines/laptop/machine.nix
@@ -2,4 +2,5 @@
   hostname = "lenovo";
   usernames = ["andromeda"];
   system = "x86_64-linux";
+  hardware-configuration = ./hardware-configuration.nix;
 }

From f53da444568b41d5fb49a6fcf216573ba3dbb8c5 Mon Sep 17 00:00:00 2001
From: andromeda <andromeda@lenovo>
Date: Tue, 30 Dec 2025 02:04:26 +0100
Subject: [PATCH 2/3] add btrfs root

---
 machines/laptop/hardware-configuration.nix | 33 ++++++++++++++++++++--
 1 file changed, 30 insertions(+), 3 deletions(-)

diff --git a/machines/laptop/hardware-configuration.nix b/machines/laptop/hardware-configuration.nix
index e0a98d9..654a931 100644
--- a/machines/laptop/hardware-configuration.nix
+++ b/machines/laptop/hardware-configuration.nix
@@ -18,11 +18,38 @@
   boot.extraModulePackages = [];
 
   fileSystems."/" = {
-    device = "none";
-    fsType = "tmpfs";
-    options = ["defaults" "size=60%" "mode=755"];
+    #device = "none";
+    #fsType = "tmpfs";
+    #options = ["defaults" "size=60%" "mode=755"];
+    device = "/dev/disk/by-uuid/16c93673-4f0e-4010-a7f4-7ccffb20edb7";
+    fsType = "btrfs";
   };
 
+  boot.initrd.postResumeCommands = lib.mkAfter ''
+    mkdir /btrfs_tmp
+    mount ${config.fileSystems."/".device} /btrfs_tmp
+    if [[ -e /btrfs_tmp/root ]]; then
+      mkdir -p /btrfs_tmp/old_roots
+      timestamp=$(date --date="@$(stat -c %Y /btrfs_tmp/root)" "+%Y-%m-%-d_%H:$M:%S")
+      mv /btrfs_tmp/root "/btrfs_tmp/old_roots/$timestamp"
+    fi
+
+    delete_subvolume_recursively() {
+      IFS=$'\n'
+      for i in $(btrfs subvolume list -o "$1" | cut -f 9- -d ' '); do
+        delete_subvolume_recursively "/btrfs_tmp/$i"
+      done
+      btrfs subvolume delete "$1"
+    }
+
+    for i in $(find /btrfs_tmp/old_roots/ -maxdepth 1 -mtime +30); do
+      delete_subvolume_recursively "$i"
+    done
+
+    btrfs subvolume create /btrfs_tmp/root
+    umount /btrfs_tmp
+  '';
+
   fileSystems."/nix" = {
     device = "/dev/disk/by-uuid/0e586651-36f4-42b0-99b3-3f0704a894d6";
     fsType = "btrfs";

From 9a089ea5090c72e363446b1576724edfbdb42c81 Mon Sep 17 00:00:00 2001
From: andromeda <andromeda@lenovo>
Date: Tue, 30 Dec 2025 11:32:29 +0100
Subject: [PATCH 3/3] fix bugs with wallpaper and btrfs subvolume

---
 machines/laptop/hardware-configuration.nix | 1 +
 users/andromeda/home.nix                   | 2 +-
 users/andromeda/stylix.nix                 | 1 +
 3 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/machines/laptop/hardware-configuration.nix b/machines/laptop/hardware-configuration.nix
index 654a931..bde1c83 100644
--- a/machines/laptop/hardware-configuration.nix
+++ b/machines/laptop/hardware-configuration.nix
@@ -23,6 +23,7 @@
     #options = ["defaults" "size=60%" "mode=755"];
     device = "/dev/disk/by-uuid/16c93673-4f0e-4010-a7f4-7ccffb20edb7";
     fsType = "btrfs";
+    options = ["subvol=root"];
   };
 
   boot.initrd.postResumeCommands = lib.mkAfter ''
diff --git a/users/andromeda/home.nix b/users/andromeda/home.nix
index 526d677..3812842 100644
--- a/users/andromeda/home.nix
+++ b/users/andromeda/home.nix
@@ -111,7 +111,7 @@ in {
       pkgs.tree
       pkgs.zoxide
     ];
-    file.${background-path}.source = pkgs.nixos-artwork.wallpapers.gear;
+    file.${background-path}.source = config.stylix.image;
   };
   programs = {
     alacritty.enable = true;
diff --git a/users/andromeda/stylix.nix b/users/andromeda/stylix.nix
index 2e7af13..7f56575 100644
--- a/users/andromeda/stylix.nix
+++ b/users/andromeda/stylix.nix
@@ -10,6 +10,7 @@
     # silk-light is light theme
     base16Scheme = "${pkgs.base16-schemes}/share/themes/gruvbox-material-dark-hard.yaml";
     polarity = "dark";
+    image = "${pkgs.nixos-artwork.wallpapers.gear}/share/backgrounds/nixos/nix-wallpaper-gear.png";
     fonts = {
       monospace = {
         package = pkgs.miracode;