From bdb9cd1e172af5895cb47c1266350cd53edd0a47 Mon Sep 17 00:00:00 2001
From: Tomas Hlavaty <tom@logand.com>
Date: Mon, 2 Jan 2017 19:26:48 +0100
Subject: [PATCH] cjdns service: optionally add cjdns hosts to
 networking.extraHosts

Enabling this incurs a heavy eval-time cost, but it's a nice usability
enhancement; satisfy both concerns by making it optional (default
false).
---
 nixos/modules/services/networking/cjdns.nix | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/nixos/modules/services/networking/cjdns.nix b/nixos/modules/services/networking/cjdns.nix
index 839a5bf07389..a10851c16523 100644
--- a/nixos/modules/services/networking/cjdns.nix
+++ b/nixos/modules/services/networking/cjdns.nix
@@ -195,6 +195,16 @@ in
         };
       };
 
+      addExtraHosts = mkOption {
+        type = types.bool;
+        default = false;
+        description = ''
+          Whether to add cjdns peers with an associated hostname to
+          <filename>/etc/hosts</filename>.  Beware that enabling this
+          incurs heavy eval-time costs.
+        '';
+      };
+
     };
 
   };
@@ -257,7 +267,7 @@ in
       };
     };
 
-    networking.extraHosts = cjdnsExtraHosts;
+    networking.extraHosts = mkIf cfg.addExtraHosts cjdnsExtraHosts;
 
     assertions = [
       { assertion = ( cfg.ETHInterface.bind != "" || cfg.UDPInterface.bind != "" || cfg.confFile != null );