From 0feeccbfc3f7e9790340a92182461a7fdc9361ac Mon Sep 17 00:00:00 2001
From: Matthew Critchlow <mcritchlow@ucsd.edu>
Date: Fri, 31 Jan 2020 12:01:29 -0800
Subject: [PATCH] Support alpine versions (#20)

* Support multiple alpine versions in Dockerfile

Add an ARG to the Dockerfile to support passing in build-args when
running docker build to support different alpine base image versions.

* Create push.sh script for managing image updates

The push.sh script supports passing multiple alpine tags which will then
be built, tagged, and pushed to docker hub
---
 Dockerfile |  3 ++-
 push.sh    | 20 ++++++++++++++++++++
 2 files changed, 22 insertions(+), 1 deletion(-)
 create mode 100755 push.sh

diff --git a/Dockerfile b/Dockerfile
index 667915a..b29ee4b 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,5 @@
-FROM alpine:latest
+ARG ALPINE_VERSION=latest
+FROM alpine:${ALPINE_VERSION}
 LABEL maintaner="Bojan Cekrlic - https://github.com/bokysan/docker-postfix/"
 
 # See README.md for details
diff --git a/push.sh b/push.sh
new file mode 100755
index 0000000..d379012
--- /dev/null
+++ b/push.sh
@@ -0,0 +1,20 @@
+#!/usr/bin/env sh
+
+if [ $# -eq 0 ]; then
+  echo "No alpine build versions supplied"
+  echo "example usage: ./push.sh latest 3.10 3.9"
+  exit 1
+fi
+
+# Authenticate to push images
+docker login
+
+# build, tag, and push alpine versions supplied as script arguments
+base_repo=boky/postfix
+for alpine_version in "$@"
+do
+  docker build -t "$base_repo":"$alpine_version" --build-arg=ALPINE_VERSION="$alpine_version" .
+  docker push "$base_repo":"$alpine_version"
+done
+
+