From 1ef9dd84c91caacdada8def905511bd68a670851 Mon Sep 17 00:00:00 2001
From: Julien Malka <julien@malka.sh>
Date: Mon, 30 Sep 2024 10:42:30 +0200
Subject: [PATCH] feat: activate impermanence on gallifrey

---
 machines/gallifrey/default.nix     | 18 ++++++++++++++-
 machines/gallifrey/hardware.nix    | 13 ++++++++++-
 machines/gallifrey/home-julien.nix |  9 ++++++++
 modules/hmgr/default.nix           | 35 +++++++++++++++++++-----------
 4 files changed, 60 insertions(+), 15 deletions(-)

diff --git a/machines/gallifrey/default.nix b/machines/gallifrey/default.nix
index 305af32..ec4cc09 100644
--- a/machines/gallifrey/default.nix
+++ b/machines/gallifrey/default.nix
@@ -25,7 +25,7 @@
 
   networking.networkmanager.dns = "systemd-resolved";
   services.resolved.enable = true;
-  services.userborn.enable = true;
+  #services.userborn.enable = true;
 
   services.displayManager.autoLogin = {
     enable = true;
@@ -99,5 +99,21 @@
     xorg.xinit
   ];
 
+  environment.persistence."/persistent" = {
+    hidemounts = true;
+    directories = [
+      "/var/lib"
+      "/var/log"
+    ];
+    files = [
+      "/etc/machine-id"
+      "/etc/ssh/ssh_host_ed25519_key"
+      "/etc/ssh/ssh_host_ed25519_key.pub"
+    ];
+  };
+  programs.fuse.userAllowOther = true;
+
+  filesystems."/persistent".neededforboot = true;
+
   system.stateVersion = "24.11";
 }
diff --git a/machines/gallifrey/hardware.nix b/machines/gallifrey/hardware.nix
index 6ac15d7..69e7308 100644
--- a/machines/gallifrey/hardware.nix
+++ b/machines/gallifrey/hardware.nix
@@ -1,7 +1,12 @@
 # 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.
-{ lib, modulesPath, ... }:
+{
+  lib,
+  modulesPath,
+  pkgs,
+  ...
+}:
 
 {
   imports = [
@@ -18,6 +23,12 @@
   boot.kernelModules = [ ];
   boot.extraModulePackages = [ ];
 
+  boot.initrd.postDeviceCommands = ''
+    lvm lvremove --force /dev/mainpool/root || :
+    yes | lvm lvcreate --size 100G --name root mainpool
+    ${pkgs.e2fsprogs}/bin/mkfs.ext4 /dev/mainpool/root
+  '';
+
   # 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
diff --git a/machines/gallifrey/home-julien.nix b/machines/gallifrey/home-julien.nix
index 8a21341..aab777b 100644
--- a/machines/gallifrey/home-julien.nix
+++ b/machines/gallifrey/home-julien.nix
@@ -76,6 +76,15 @@
 
     fonts.fontconfig.enable = true;
 
+    home.persistence."/persistent/home/julien" = {
+      directories = [
+        "Pictures"
+        "Documents"
+        ".ssh"
+      ];
+      allowOther = true;
+    };
+
     programs.firefox = {
       enable = true;
       package = pkgs.firefox;
diff --git a/modules/hmgr/default.nix b/modules/hmgr/default.nix
index f2bc27a..29d3513 100644
--- a/modules/hmgr/default.nix
+++ b/modules/hmgr/default.nix
@@ -1,4 +1,9 @@
-{ config, lib, ... }:
+{
+  config,
+  lib,
+  inputs,
+  ...
+}:
 let
   cfg = config.luj.hmgr;
 in
@@ -10,16 +15,20 @@ with lib;
 
   config = {
     home-manager.useGlobalPkgs = true;
-    home-manager.users =
-      lib.mapAttrs
-        (name: value:
-          {
-            imports = with builtins; (map (x: ../../home-manager-modules + "/${x}/default.nix") (attrNames (readDir ../../home-manager-modules)));
-            home.username = "${name}";
-            home.homeDirectory = "/home/${name}";
-            home.stateVersion = "21.05";
-          } // value)
-        cfg;
+    home-manager.users = lib.mapAttrs (
+      name: value:
+      {
+        imports =
+          with builtins;
+          (map (x: ../../home-manager-modules + "/${x}/default.nix") (
+            attrNames (readDir ../../home-manager-modules)
+          ))
+          ++ [ "${inputs.impermanence}/home-manager.nix" ];
+        home.username = "${name}";
+        home.homeDirectory = "/home/${name}";
+        home.stateVersion = "21.05";
+      }
+      // value
+    ) cfg;
   };
-}  
-
+}