From 2e131e1f45dd01bef5231744745931afadccdf90 Mon Sep 17 00:00:00 2001
From: Ctem <c@ctem.me>
Date: Wed, 6 Jan 2021 19:38:56 +0900
Subject: [PATCH] nixos/chrony: add option to choose between two commonly used
 server directive options

---
 nixos/modules/services/networking/ntp/chrony.nix | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/nixos/modules/services/networking/ntp/chrony.nix b/nixos/modules/services/networking/ntp/chrony.nix
index 5842761ba7e2..42dbc5c5612b 100644
--- a/nixos/modules/services/networking/ntp/chrony.nix
+++ b/nixos/modules/services/networking/ntp/chrony.nix
@@ -10,7 +10,7 @@ let
   keyFile = "${stateDir}/chrony.keys";
 
   configFile = pkgs.writeText "chrony.conf" ''
-    ${concatMapStringsSep "\n" (server: "server " + server + " iburst" + optionalString (cfg.enableNTS) " nts") cfg.servers}
+    ${concatMapStringsSep "\n" (server: "server " + server + " " + cfg.serverOption + optionalString (cfg.enableNTS) " nts") cfg.servers}
 
     ${optionalString
       (cfg.initstepslew.enabled && (cfg.servers != []))
@@ -47,6 +47,20 @@ in
         '';
       };
 
+      serverOption = mkOption {
+        default = "iburst";
+        type = types.enum [ "iburst" "offline" ];
+        description = ''
+          Set option for server directives.
+
+          Use "iburst" to rapidly poll on startup. Recommended if your machine
+          is consistently online.
+
+          Use "offline" to prevent polling on startup. Recommended if your
+          machine boots offline or is otherwise frequently offline.
+        '';
+      };
+
       enableNTS = mkOption {
         type = types.bool;
         default = false;