From f7c50a8aa060b38c9b8fa0a40fca6e7049be2652 Mon Sep 17 00:00:00 2001
From: pacien <pacien.trangirard@pacien.net>
Date: Mon, 9 Nov 2020 04:35:12 +0100
Subject: [PATCH] nixos/ssmtp: add assertion for useSTARTTLS dependency on
 useTLS

services.ssmtp.useSTARTTLS has no effect when services.ssmtp.useTLS is disabled.
---
 nixos/modules/programs/ssmtp.nix | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/nixos/modules/programs/ssmtp.nix b/nixos/modules/programs/ssmtp.nix
index 98ff21bd37f2..1f49ddc91bb3 100644
--- a/nixos/modules/programs/ssmtp.nix
+++ b/nixos/modules/programs/ssmtp.nix
@@ -142,6 +142,13 @@ in
 
   config = mkIf cfg.enable {
 
+    assertions = [
+      {
+        assertion = cfg.useSTARTTLS -> cfg.useTLS;
+        message = "services.ssmtp.useSTARTTLS has no effect without services.ssmtp.useTLS";
+      }
+    ];
+
     services.ssmtp.settings = mkMerge [
       ({
         MailHub = cfg.hostName;