From facd55b2c0a8122525bda4aeaad2fd7aab581301 Mon Sep 17 00:00:00 2001
From: Sam Yaple <sam@yaple.net>
Date: Thu, 10 Aug 2017 14:31:01 -0400
Subject: [PATCH] Use build-arg to make FROM image a variable

Change-Id: Iea771b76e40aebce28cf61e79be90bb77d2fc1f8
---
 centos/Dockerfile | 3 ++-
 debian/Dockerfile | 3 ++-
 ubuntu/Dockerfile | 3 ++-
 3 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/centos/Dockerfile b/centos/Dockerfile
index c641fa0..c05f4f6 100644
--- a/centos/Dockerfile
+++ b/centos/Dockerfile
@@ -1,4 +1,5 @@
-FROM centos:7
+ARG FROM=centos:7
+FROM ${FROM}
 
 ENV PATH=/var/lib/openstack/bin:$PATH
 ENV PROJECT=keystone
diff --git a/debian/Dockerfile b/debian/Dockerfile
index b364144..4000564 100644
--- a/debian/Dockerfile
+++ b/debian/Dockerfile
@@ -1,4 +1,5 @@
-FROM debian:jessie-slim
+ARG FROM=debian:jessie-slim
+FROM ${FROM}
 
 ENV PATH=/var/lib/openstack/bin:$PATH
 ENV PROJECT=keystone
diff --git a/ubuntu/Dockerfile b/ubuntu/Dockerfile
index b737c1c..a466e40 100644
--- a/ubuntu/Dockerfile
+++ b/ubuntu/Dockerfile
@@ -1,4 +1,5 @@
-FROM ubuntu:xenial
+ARG FROM=ubuntu:xenial
+FROM ${FROM}
 
 ENV PATH=/var/lib/openstack/bin:$PATH
 ENV PROJECT=keystone