From 2783860e4ec26caa82af5966773659270caa6664 Mon Sep 17 00:00:00 2001
From: andromeda <andromeda@lenovo>
Date: Sun, 19 Apr 2026 12:15:31 +0200
Subject: update inputs

---
 modules/nixos/machines/lenovo.nix | 88 +++++++++++++++++++++++++++------------
 1 file changed, 61 insertions(+), 27 deletions(-)

(limited to 'modules')

diff --git a/modules/nixos/machines/lenovo.nix b/modules/nixos/machines/lenovo.nix
index 86255b1..537c5e5 100644
--- a/modules/nixos/machines/lenovo.nix
+++ b/modules/nixos/machines/lenovo.nix
@@ -17,36 +17,70 @@
     options = ["subvol=root"];
   };
 
-  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
+  boot.initrd.systemd = {
+    services.impermanent-btrfs = {
+      description = "saves old root and makes new one";
+      unitConfig.DefaultDependencies = false;
+      serviceConfig = {
+        Type = "oneshot";
+        StandardOutput = "journal+console";
+        StandardError = "journal+console";
+      };
+      requiredBy = [
+        "initrd.target"
+      ];
+      before = [
+        "sysroot.mount"
+      ];
+      requires = [
+        "initrd-root-device.target"
+      ];
+      after = [
+        "initrd-root-device.target"
+        "local-fs-pre.target"
+      ];
+      script = ''
+        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 "$1"
-    }
+        delete_subvolume_recursively() {
+          IFS=$'\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
+        for i in $(find /btrfs_tmp/old_roots/ -maxdepth 1 -mtime +30); do
+          delete_subvolume_recursively "$i"
+        done
 
-    btrfs subvolume create /btrfs_tmp/root
-    mkdir /btrfs_tmp/root/persist
-    mkdir /btrfs_tmp/root/etc
-    mount ${config.fileSystems."/persist".device} /btrfs_tmp/root/persist -o subvol=persist
-    cp /btrfs_tmp/root/persist/etc/ssh /btrfs_tmp/root/etc/ssh -r
-    umount /btrfs_tmp/root/persist
-    rm -r /btrfs_tmp/root/persist
-    umount /btrfs_tmp
-  '';
+        btrfs subvolume create /btrfs_tmp/root
+        mkdir /btrfs_tmp/root/persist
+        mkdir /btrfs_tmp/root/etc
+        mount ${config.fileSystems."/persist".device} /btrfs_tmp/root/persist -o subvol=persist
+        cp /btrfs_tmp/root/persist/etc/ssh /btrfs_tmp/root/etc/ssh -r
+        umount /btrfs_tmp/root/persist
+        rm -r /btrfs_tmp/root/persist
+        umount /btrfs_tmp
+      '';
+    };
+    extraBin = {
+      "mkdir" = "${pkgs.coreutils}/bin/mkdir";
+      "date" = "${pkgs.coreutils}/bin/date";
+      "stat" = "${pkgs.coreutils}/bin/stat";
+      "mv" = "${pkgs.coreutils}/bin/mv";
+      "cp" = "${pkgs.coreutils}/bin/cp";
+      "rm" = "${pkgs.coreutils}/bin/rm";
+      "btrfs" = "${pkgs.btrfs-progs}/bin/btrfs";
+      # find, mount, umount already there
+    };
+  };
 
   fileSystems."/nix" = {
     device = "/dev/disk/by-uuid/0e586651-36f4-42b0-99b3-3f0704a894d6";
-- 
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