From c1a9a89c9a211b48bb04f1862a216bb5d444c3a2 Mon Sep 17 00:00:00 2001
From: tv <tv@krebsco.de>
Date: Sun, 14 Feb 2016 12:28:56 +0100
Subject: [PATCH] lib.toC: admit derivations

---
 krebs/4lib/default.nix | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/krebs/4lib/default.nix b/krebs/4lib/default.nix
index 4d7e0b549..d5b6d03ac 100644
--- a/krebs/4lib/default.nix
+++ b/krebs/4lib/default.nix
@@ -26,11 +26,15 @@ let out = rec {
   shell = import ./shell.nix { inherit lib; };
   tree = import ./tree.nix { inherit lib; };
 
-  toC = x: {
+  toC = x: let
+    type = typeOf x;
+    reject = throw "cannot convert ${type}";
+  in {
     list = "{ ${concatStringsSep ", " (map toC x)} }";
     null = "NULL";
+    set = if isDerivation x then toJSON x else reject;
     string = toJSON x; # close enough
-  }.${typeOf x};
+  }.${type} or reject;
 
   subdirsOf = path:
     mapAttrs (name: _: path + "/${name}")