Major rework in progress

system/disko/impermanent.nix

@@ -0,0 +1,29 @@
+{ config, lib, ... }: {
+
+    boot.initrd.postDeviceCommands = lib.mkAfter ''
+        mkdir /btrfs_tmp
+        mount /dev/root_vg/root /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/$timestamp"
+        fi
+
+        deleteSubvolumeRecursively() {
+            IFS=$'\n'
+            for i in $(btrfs subvolume list -o "$1" | cut -f 9- -d ' '); do
+                deleteSubvolumeRecursively "/btrfs_tmp/$i"
+            done;
+            btrfs subvolume delete $1
+        }
+
+        for i in $(find /btrfs_tmp/old_roots -maxdepth 1 -mtime +30); do
+            deleteSubvolumeRecursively "$i"
+        done
+
+        btrfs subvolume create /btrfs_tmp/root
+        umount /btrfs_tmp
+    '';
+
+    config.initialPasswords = lib.mkForce true;
+}