From 57cce73c3d3439b4b6a73ed6963502daef408b7e Mon Sep 17 00:00:00 2001
From: Anthony Jackson <anthony@betaplum.com>
Date: Mon, 10 Apr 2017 22:18:29 +0200
Subject: Only print lines for os var that are set

---
 priv/templates/extended_bin | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/priv/templates/extended_bin b/priv/templates/extended_bin
index 1b619d4..87128b7 100755
--- a/priv/templates/extended_bin
+++ b/priv/templates/extended_bin
@@ -229,7 +229,8 @@ replace_os_vars() {
     awk '{
         while(match($0,"[$]{[^}]*}")) {
             var=substr($0,RSTART+2,RLENGTH -3)
-            gsub("[$]{"var"}",ENVIRON[var])
+            if (ENVIRON[var]) gsub("[$]{"var"}",ENVIRON[var]);
+            else next
         }
     }1' < "$1" > "$2"
 }
-- 
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