From 6df0bff9085d8067a123be5f0f435ad7bbed6d25 Mon Sep 17 00:00:00 2001
From: zimbatm <zimbatm@zimbatm.com>
Date: Mon, 4 Jul 2016 15:10:51 +0100
Subject: [PATCH] nixos: throw an error on invalid shell package

All shell packages must export the shellPath passthru
---
 nixos/lib/utils.nix | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/nixos/lib/utils.nix b/nixos/lib/utils.nix
index 871fbb121d03..40d0854d968d 100644
--- a/nixos/lib/utils.nix
+++ b/nixos/lib/utils.nix
@@ -12,6 +12,8 @@ rec {
   toShellPath = shell:
     if types.shellPackage.check shell then
       "/run/current-system/sw${shell.shellPath}"
+    else if types.package.check shell then
+      throw "${shell} is not a shell package"
     else
       shell;
 }