From 6b59fe3d8bf8f974c85d54ad1a85e1790c7a61fd Mon Sep 17 00:00:00 2001
From: Will Rouesnel <w.rouesnel@gmail.com>
Date: Fri, 22 Dec 2017 11:10:47 +1100
Subject: [PATCH] Add DOCKER_PREFIX for internal builds.

---
 docker-squid/Dockerfile | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/docker-squid/Dockerfile b/docker-squid/Dockerfile
index 0243198..64516e3 100644
--- a/docker-squid/Dockerfile
+++ b/docker-squid/Dockerfile
@@ -1,4 +1,6 @@
-FROM ubuntu:artful
+ARG DOCKER_PREFIX=
+
+FROM ${DOCKER_PREFIX}ubuntu:artful
 
 # Normalize apt sources
 RUN cat /etc/apt/sources.list | grep -v '^#' | sed /^$/d | sort | uniq > sources.tmp.1 && \