From cddfe9418bad24a571b2a55521a2a34f883da54a Mon Sep 17 00:00:00 2001
From: Matthew Bauer <mjbauer95@gmail.com>
Date: Mon, 19 Mar 2018 12:18:44 -0500
Subject: [PATCH] Check that version is actually newer via compareVersions

---
 up.sh | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/up.sh b/up.sh
index 18f719c..091e5a2 100755
--- a/up.sh
+++ b/up.sh
@@ -23,6 +23,11 @@ function error_exit {
     exit 1
 }
 
+if ! [ $(nix-instantiate --eval -E "builtins.compareVersions '$NEW_VERSION' '$OLD_VERSION'") -eq  1 ];
+then
+    error_exit "$NEW_VERSION is not newer than $OLD_VERSION according to Nix"
+fi
+
 # Package blacklist
 case "$PACKAGE_NAME" in
     *jquery*) error_exit "this isn't a real package";;