build.sh

#!/bin/bash

VERSION=""
NAME=""
DIR=""

while getopts "v:n" opt; do
	case $opt in
		v)
			VERSION=$OPTARG
			;;
		n)
			NAME=$OPTARG
			;;
		d)
			DIR=$OPTARG
			;;
		\?)
			echo "Invalid option: -$OPTARG" >&2
			exit
			;;
	esac
done

shift $(( OPTIND - 1 ))

DIR=$1

if [ -z "$DIR" ]; then
	echo "dir is required"  >&2
	exit -2
fi

cd $DIR

if [ ! -f Dockerfile ]; then
	echo "no Dockerfile" >&2
	exit -3
fi

if [ -z "$VERSION" ]; then
	VERSION=$(grep -E "^#\s*VERSION:" Dockerfile  | cut -d ':' -f 2 | tr -d ' ')
	if [ -z "$VERSION" ]; then
		echo "version is required"  >&2
		exit -2
	fi
fi

if [ -z "$NAME" ]; then
	NAME=$(grep -E "^#\s*NAME:" Dockerfile  | cut -d ':' -f 2 | tr -d ' ')
	if [ -z "$NAME" ]; then
		NAME=$(basename $DIR)
	fi
fi

docker build --rm -t $NAME:$VERSION $DIR

docker inspect $NAME:$VERSION > $NAME-$VERSION.json

# this is a hack as you can only export containers, not images
# save does not do what you would expect it to do
ID=$(docker run -d $NAME:$VERSION "sleep 1")
sleep 3
docker export $ID | gzip -9 > $NAME-$VERSION.tar.gz