From 6832ae20b017b183e8547406a40767b65850a2b3 Mon Sep 17 00:00:00 2001
From: Adam Harrison <harrisonadamw@gmail.com>
Date: Tue, 14 Jul 2015 15:31:14 +0100
Subject: [PATCH] Implement `weave dns-lookup`

---
 prog/weaveexec/Dockerfile | 1 +
 weave                     | 6 ++++++
 2 files changed, 7 insertions(+)

diff --git a/prog/weaveexec/Dockerfile b/prog/weaveexec/Dockerfile
index c4cdb7a3..d704e75a 100644
--- a/prog/weaveexec/Dockerfile
+++ b/prog/weaveexec/Dockerfile
@@ -9,6 +9,7 @@ RUN apk add --update \
     iproute2 \
     util-linux \
     conntrack-tools \
+    bind-tools \
   && rm -rf /var/cache/apk/*
 
 WORKDIR /home/weave
diff --git a/weave b/weave
index ad979a1d..0a4e3e70 100755
--- a/weave
+++ b/weave
@@ -47,6 +47,7 @@ weave attach        [<addr> ...] <container_id>
 weave detach        [<addr> ...] <container_id>
 weave dns-add       <ip_address> [<ip_address> ...] <container_id> [-h <fqdn>]
 weave dns-remove    <ip_address> [<ip_address> ...] <container_id> [-h <fqdn>]
+weave dns-lookup    <unqualified_name>
 weave expose        [<addr> ...] [-h <fqdn>]
 weave hide          [<addr> ...]
 weave ps            [<container_id> ...]
@@ -1333,6 +1334,11 @@ case "$COMMAND" in
             delete_dns_fqdn $CONTAINER "$3" $IP_ARGS
         fi
         ;;
+    dns-lookup)
+        [ $# -eq 1 ] || usage
+        docker_bridge_ip
+        dig @$DOCKER_BRIDGE_IP +short $1
+        ;;
     expose)
         collect_cidr_args "$@"
         shift $CIDR_ARG_COUNT