From 9a4ceabb01eca7ad9726ea1168210c0e85185267 Mon Sep 17 00:00:00 2001
From: Pawel Krawczyk <p.krawczyk@kainos.com>
Date: Wed, 31 Dec 2014 17:34:16 +0000
Subject: [PATCH] only create set if it does not exist

---
 blacklist.sh | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/blacklist.sh b/blacklist.sh
index 636e863..a56bd29 100644
--- a/blacklist.sh
+++ b/blacklist.sh
@@ -66,8 +66,11 @@ for url in $urls; do
     new_list_size=$(wc -l "${sorted_blocklist}" | awk '{print $1;}' )
     hash_size=$(expr $new_list_size / 2)
 
+    if ! ipset -q list ${set_name} >/dev/null ; then
+        ipset create ${set_name} hash:net family inet
+    fi
+
     # start writing new set file
-    echo "create ${set_name} hash:net family inet" >>"${new_set_file}"
     echo "create ${tmp_set_name} hash:net family inet hashsize ${hash_size} maxelem ${new_list_size}" >>"${new_set_file}"
 
     # convert list of IPs to ipset statements