From 1ea4104d3af12fc5729ab511eedfa0033527f4da Mon Sep 17 00:00:00 2001
From: William <baduhai@proton.me>
Date: Thu, 7 Dec 2023 13:26:36 -0300
Subject: [PATCH] we are not ephemeral

---
 hosts/common/boot.nix                         |  2 +-
 hosts/desktops/rotterdam/default.nix          |  2 +-
 hosts/desktops/rotterdam/ephermal.nix         | 45 ++++++++++++++
 .../rotterdam/hardware-configuration.nix      | 61 +++++++++++--------
 4 files changed, 84 insertions(+), 26 deletions(-)
 create mode 100644 hosts/desktops/rotterdam/ephermal.nix

diff --git a/hosts/common/boot.nix b/hosts/common/boot.nix
index 9d4c57f..21dfa9f 100644
--- a/hosts/common/boot.nix
+++ b/hosts/common/boot.nix
@@ -4,7 +4,7 @@
   boot = {
     loader = {
       timeout = 1;
-      efi.canTouchEfiVariables = true;
+      # efi.canTouchEfiVariables = true;
       systemd-boot = {
         enable = true;
         editor = false;
diff --git a/hosts/desktops/rotterdam/default.nix b/hosts/desktops/rotterdam/default.nix
index 704aaf0..7627914 100644
--- a/hosts/desktops/rotterdam/default.nix
+++ b/hosts/desktops/rotterdam/default.nix
@@ -1,5 +1,5 @@
 { ... }:
 
 {
-  imports = [ ./hardware-configuration.nix ];
+  imports = [ ./hardware-configuration.nix ./ephermal.nix ];
 }
diff --git a/hosts/desktops/rotterdam/ephermal.nix b/hosts/desktops/rotterdam/ephermal.nix
new file mode 100644
index 0000000..f794ba1
--- /dev/null
+++ b/hosts/desktops/rotterdam/ephermal.nix
@@ -0,0 +1,45 @@
+{ config, lib, pkgs, ... }:
+
+{
+  boot.initrd.systemd.services.recreate-root = {
+    description = "Rolling over and creating new filesystem root";
+    requires = [ "initrd-root-device.target" ];
+    after = [ "local-fs-pre.target" "initrd-root-device.target" ];
+    requiredBy = [ "initrd-root-fs.target" ];
+    before = [ "sysroot.mount" ];
+    unitConfig = {
+      AssertPathExists = "/etc/initrd-release";
+      DefaultDependencies = false;
+    };
+    serviceConfig = {
+      Type = "oneshot";
+      RemainAfterExit = true;
+    };
+    script = ''
+      mkdir /btrfs_tmp
+      mount /dev/disk/by-uuid/3287dbc3-c0fa-4096-a0b3-59b017cfecc8 /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
+      rmdir btrfs_tmp
+    '';
+  };
+}
diff --git a/hosts/desktops/rotterdam/hardware-configuration.nix b/hosts/desktops/rotterdam/hardware-configuration.nix
index f24b973..4a68d06 100644
--- a/hosts/desktops/rotterdam/hardware-configuration.nix
+++ b/hosts/desktops/rotterdam/hardware-configuration.nix
@@ -1,37 +1,50 @@
-# Do not modify this file!  It was generated by ‘nixos-generate-config’
-# and may be overwritten by future invocations.  Please make changes
-# to /etc/nixos/configuration.nix instead.
-{ config, pkgs, lib, modulesPath, ... }:
+{ config, lib, modulesPath, ... }:
 
 {
   imports = [ (modulesPath + "/installer/scan/not-detected.nix") ];
 
-  boot.initrd.availableKernelModules =
-    [ "xhci_pci" "ahci" "usbhid" "usb_storage" "sd_mod" ];
-  boot.initrd.kernelModules = [ ];
-  boot.kernelModules = [ "kvm-amd" ];
-  boot.extraModulePackages = [ ];
-
-  fileSystems."/" = {
-    device = "/dev/disk/by-uuid/9ccbb9e3-addc-42a3-b5d8-1e81eed37548";
-    fsType = "ext4";
+  boot = {
+    initrd = {
+      availableKernelModules = [ "nvme" "xhci_pci" "ahci" "usbhid" "sd_mod" ];
+      luks.devices."cryptroot".device =
+        "/dev/disk/by-uuid/f7dd4142-7109-4493-834d-4a831777f08d";
+    };
+    kernelModules = [ "kvm-amd" ];
   };
 
-  fileSystems."/boot/efi" = {
-    device = "/dev/disk/by-uuid/7707-0E25";
-    fsType = "vfat";
+  fileSystems = {
+    "/" = {
+      device = "/dev/disk/by-uuid/3287dbc3-c0fa-4096-a0b3-59b017cfecc8";
+      fsType = "btrfs";
+      options = [ "subvol=@root" "noatime" "compress=zstd" ];
+    };
+    "/boot/efi" = {
+      device = "/dev/disk/by-uuid/1F5A-8945";
+      fsType = "vfat";
+      options = [ "noatime" "fmask=0077" "dmask=0077" ];
+    };
+    "/nix" = {
+      device = "/dev/disk/by-uuid/3287dbc3-c0fa-4096-a0b3-59b017cfecc8";
+      fsType = "btrfs";
+      options = [ "subvol=@nix" "noatime" "compress=zstd" ];
+    };
+    "/persistent" = {
+      device = "/dev/disk/by-uuid/3287dbc3-c0fa-4096-a0b3-59b017cfecc8";
+      fsType = "btrfs";
+      options = [ "subvol=@persistent" "noatime" "compress=zstd" ];
+    };
+    "/swap" = {
+      device = "/dev/disk/by-uuid/3287dbc3-c0fa-4096-a0b3-59b017cfecc8";
+      fsType = "btrfs";
+      options = [ "subvol=@swap" "noatime" ];
+    };
   };
 
-  swapDevices =
-    [{ device = "/dev/disk/by-uuid/39005453-0ac9-4fee-bdd3-7ea9bb6f9ca6"; }];
+  swapDevices = [{ device = "/swap/swapfile"; }];
 
-  # 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
-  # with explicit per-interface declarations with `networking.interfaces.<interface>.useDHCP`.
   networking.useDHCP = lib.mkDefault true;
-  # networking.interfaces.enp34s0.useDHCP = lib.mkDefault true;
-  # networking.interfaces.wlo1.useDHCP = lib.mkDefault true;
+
+  nixpkgs.hostPlatform = lib.mkDefault "x86_64-linux";
 
   hardware.cpu.amd.updateMicrocode =
     lib.mkDefault config.hardware.enableRedistributableFirmware;