From: Mark Wooding <mdw@distorted.org.uk>
Date: Sat, 23 Jul 2011 11:45:38 +0000 (+0100)
Subject: functions.m4: Make clearchain tolerant of existing chains.
X-Git-Url: https://git.distorted.org.uk/~mdw/firewall/commitdiff_plain/e91f4bbf73b2117374ce030959f75b7c7d8fae4a

functions.m4: Make clearchain tolerant of existing chains.

It's a handy way to make chains which are populated elsewhere, e.g., by
fail2ban.
---

diff --git a/functions.m4 b/functions.m4
index b2e3cb6..fd24364 100644
--- a/functions.m4
+++ b/functions.m4
@@ -85,7 +85,7 @@ clearchain () {
       *:*) table=${chain%:*} chain=${chain#*:} ;;
       *) table=filter ;;
     esac
-    run ip46tables -t $table -N $chain
+    run ip46tables -t $table -N $chain 2>/dev/null || :
   done
 }