From b22bf0c4b0e45eebc1af2febe573b559b718c077 Mon Sep 17 00:00:00 2001
From: Jeremy Stretch <stretch@packetlife.net>
Date: Fri, 6 Mar 2020 15:07:29 -0500
Subject: [PATCH] Fix upgrade.sh to show virtualenv warning only when needed

---
 upgrade.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/upgrade.sh b/upgrade.sh
index fe1df715b..43922dc21 100755
--- a/upgrade.sh
+++ b/upgrade.sh
@@ -64,7 +64,7 @@ COMMAND="python3 netbox/manage.py invalidate all"
 echo "Clearing cache data ($COMMAND)..."
 eval $COMMAND || exit 1
 
-if [ WARN_MISSING_VENV ]; then
+if [ -v WARN_MISSING_VENV ]; then
   echo "--------------------------------------------------------------------"
   echo "WARNING: No existing virtual environment was detected. A new one has"
   echo "been created. Update your systemd service files to reflect the new"