From 47a9e8783ac34709d31a0f6799d0fac5f3d4268a Mon Sep 17 00:00:00 2001
From: worldofpeace <worldofpeace@protonmail.ch>
Date: Mon, 5 Aug 2019 18:19:01 -0400
Subject: [PATCH] pantheon.updateScript: add a throw

---
 pkgs/desktops/pantheon/update.nix | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/pkgs/desktops/pantheon/update.nix b/pkgs/desktops/pantheon/update.nix
index 50f1fbd48460..7e9aacc0c2b2 100644
--- a/pkgs/desktops/pantheon/update.nix
+++ b/pkgs/desktops/pantheon/update.nix
@@ -29,6 +29,8 @@ let
     chmod +x $out
   '';
 
-  versionFlag = { "release" = "-r"; "master" = "-m"; }.${versionPolicy};
+  throwFlag = throw "${versionPolicy} is not a valid versionPolicy - Options are either 'release' or 'master' (defaults to release).";
+
+  versionFlag = { "release" = "-r"; "master" = "-m"; }.${versionPolicy} or throwFlag;
 
 in [ updateScript versionFlag repoName attrPath ]