From 882c2b72781b4254d9baaa370f52f050ad79b04e Mon Sep 17 00:00:00 2001
From: Moritz Ulrich <moritz@tarn-vedra.de>
Date: Mon, 4 Nov 2013 12:07:03 +0100
Subject: [PATCH] fcron: Fix error when cron.mailto is null.

Signed-off-by: Moritz Ulrich <moritz@tarn-vedra.de>
---
 nixos/modules/services/scheduling/fcron.nix | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/nixos/modules/services/scheduling/fcron.nix b/nixos/modules/services/scheduling/fcron.nix
index 0c0811ca6e0..fda29ca0482 100644
--- a/nixos/modules/services/scheduling/fcron.nix
+++ b/nixos/modules/services/scheduling/fcron.nix
@@ -8,11 +8,14 @@ let
 
   queuelen = if cfg.queuelen == null then "" else "-q ${toString cfg.queuelen}";
 
+  # Duplicate code, also found in cron.nix. Needs deduplication.
   systemCronJobs =
     ''
       SHELL=${pkgs.bash}/bin/bash
       PATH=${config.system.path}/bin:${config.system.path}/sbin
-      MAILTO="${config.services.cron.mailto}"
+      ${optionalString (config.services.cron.mailto != null) ''
+        MAILTO="${config.services.cron.mailto}"
+      ''}
       NIX_CONF_DIR=/etc/nix
       ${pkgs.lib.concatStrings (map (job: job + "\n") config.services.cron.systemCronJobs)}
     '';