From f4301e2194ede90f6fe3ab70be5e598a6eb5f2e4 Mon Sep 17 00:00:00 2001
From: Raghuram Subramani <raghus2247@gmail.com>
Date: Wed, 9 Oct 2024 18:19:57 +0530
Subject: (impermanence): Initial try.

---
 machines/x/configuration.nix          | 59 ++++++++++++++++++++++++++++++++---
 machines/x/hardware-configuration.nix | 13 --------
 2 files changed, 54 insertions(+), 18 deletions(-)

(limited to 'machines')

diff --git a/machines/x/configuration.nix b/machines/x/configuration.nix
index ed69181..82db98f 100644
--- a/machines/x/configuration.nix
+++ b/machines/x/configuration.nix
@@ -24,11 +24,35 @@
     "remapcapslock.nix"
 
     "wm_utils.nix"
-    # "qtile"
   ]);
 
-  boot.loader.systemd-boot.enable = true;
-  boot.loader.efi.canTouchEfiVariables = true;
+  boot.loader.grub.enable = true;
+  boot.loader.grub.efiSupport = true;
+
+  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/$timestamp"
+    fi
+
+    delete_subvolume_recursively() {
+        IFS=$'\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
+  '';
 
   boot.extraModprobeConfig = "options kvm_amd nested=1";
 
@@ -39,12 +63,37 @@
 
   networking.hostName = "x";
 
-  home-manager.users.compromyse = import ./home.nix;
-
   environment.variables = {
     XCURSOR_SIZE = "16";
   };
 
+  fileSystems."/persist".neededForBoot = true;
+  environment.persistence."/persist/system" = {
+    hideMounts = true;
+    directories = [
+      "/etc/nixos"
+      "/var/log"
+      "/var/lib/bluetooth"
+      "/var/lib/nixos"
+      "/var/lib/systemd/coredump"
+      "/etc/NetworkManager/system-connections"
+      { directory = "/var/lib/colord"; user = "colord"; group = "colord"; mode = "u=rwx,g=rx,o="; }
+    ];
+    files = [
+      "/etc/machine-id"
+      "/etc/shadow"
+      { file = "/var/keys/secret_file"; parentDirectory = { mode = "u=rwx,g=,o="; }; }
+    ];
+  };
+
+  programs.fuse.userAllowOther = true;
+  home-manager = {
+    extraSpecialArgs = {inherit inputs;};
+    users = {
+      "compromyse" = import ./home.nix;
+    };
+  };
+
   networking.extraHosts =
   ''
     127.0.0.1 download.labsmartlis.local
diff --git a/machines/x/hardware-configuration.nix b/machines/x/hardware-configuration.nix
index 964bbb2..7d34b69 100644
--- a/machines/x/hardware-configuration.nix
+++ b/machines/x/hardware-configuration.nix
@@ -13,19 +13,6 @@
   boot.kernelModules = [ "kvm-amd" ];
   boot.extraModulePackages = [ ];
 
-  fileSystems."/" =
-    { device = "/dev/disk/by-uuid/fb695c14-0255-4deb-a816-e74fa8c42c4b";
-      fsType = "ext4";
-    };
-
-  fileSystems."/boot" =
-    { device = "/dev/disk/by-uuid/19BE-DB3C";
-      fsType = "vfat";
-      options = [ "fmask=0077" "dmask=0077" ];
-    };
-
-  swapDevices = [ ];
-
   # Enables DHCP on each ethernet and wireless interface. In case of scripted networking
   # (the default) this is the recommended approach. When using systemd-networkd it's
   # still possible to use this option, but it's recommended to use it in conjunction
-- 
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