add timesync in initrd

machine/not522/default.nix

@@ -12,4 +12,5 @@
   ];
   system.stateVersion = "24.11";
   nixpkgs.config.allowUnsupportedSystem = true;
+  boot.initrd.timesync.enable = true;
 }

machine/not522/installer/default.nix

@@ -26,6 +26,7 @@ in {
     "${nixos-config}/machine/not522/cross-packages.nix"
     ./disko.nix
   ];
+  boot.initrd.timesync.enable = true;
 
   system.stateVersion = config.system.nixos.version;
 

modules/boot/timesync.nix

@@ -0,0 +1,36 @@
+{
+  config,
+  lib,
+  ...
+}:
+with lib; {
+  options.boot.initrd.timesync = {
+    enable = mkEnableOption "Enables time synchronization in initrd";
+  };
+
+  config = mkIf config.boot.initrd.timesync.enable {
+    boot.initrd.systemd.network = {
+      enable = true;
+      wait-online.enable = true;
+    };
+    boot.initrd.systemd.services.sync-time = {
+      description = "Network Time Synchronization";
+      wantedBy = [
+        "initrd.target"
+        "rootfs-cleanup.service"
+      ];
+      wants = [
+        "network-online.target"
+      ];
+      after = [
+        "network-online.target"
+      ];
+      before = [
+        "rootfs-cleanup.service"
+      ];
+      unitConfig.DefaultDependencies = "no";
+      environment.SYSTEMD_NSS_RESOLVE_VALIDATE = "0";
+      serviceConfig.ExecStart = "${config.boot.initrd.systemd.package}/lib/systemd/systemd-timesyncd";
+    };
+  };
+}

modules/default.nix

@@ -1,5 +1,6 @@
 {disko, ...}: {
   imports = [
+    ./boot/timesync.nix
     ./riscv.nix
     ./containers/autoconfig.nix
     ./nix

modules/environment/impermanence.nix

@@ -18,6 +18,7 @@ with lib; {
     }
     (mkIf config.environment.impermanence {
       boot.initrd.systemd.services.rootfs-cleanup = {
+        description = "Clean file system root";
         wantedBy = [
           "initrd.target"
         ];