From d1a887857d04cf095dfea3c4ca301544d334c122 Mon Sep 17 00:00:00 2001
From: Adam Harrison <harrisonadamw@gmail.com>
Date: Fri, 26 Jun 2015 17:44:37 +0100
Subject: [PATCH] Enforce maximum length on weave run hostname derivation

---
 weave | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/weave b/weave
index b36721b0..9574975d 100755
--- a/weave
+++ b/weave
@@ -693,8 +693,13 @@ dns_args() {
     DNS_ARGS="--dns $DOCKER_BRIDGE_IP"
     if [ -n "$NAME_ARG" -a -z "$HOSTNAME_SPECIFIED" ] ; then
         DOMAIN=$(dns_domain)
-        DNS_ARGS="$DNS_ARGS --hostname=$NAME_ARG.${DOMAIN%.}"
-        HOSTNAME_SPECIFIED=1
+        HOSTNAME="$NAME_ARG.${DOMAIN%.}"
+        if [ ${#HOSTNAME} -gt 64 ] ; then
+            echo "Container name too long to be used as hostname" >&2
+        else
+            DNS_ARGS="$DNS_ARGS --hostname=$HOSTNAME"
+            HOSTNAME_SPECIFIED=1
+        fi
     fi
     if [ -z "$DNS_SEARCH_SPECIFIED" ] ; then
       if [ -z "$HOSTNAME_SPECIFIED" ] ; then