m5 : an attempt to fix some Dockerfile missing features without m4

README.md

Usage

bash m5.bash Dockerfile.m5 |docker build -

Dockerfile.m5

FROM dockerfile/ubuntu

INCLUDE "javaruby.m5"

#ADD MYAPP ...

javaruby.m5

FROM dockerfile/ubuntu

#This file use existing Dockerfiles to build a working Java 8 + Ruby 2.2 env !!!!

INCLUDE "https://raw.githubusercontent.com/docker-library/buildpack-deps/master/wheezy/Dockerfile"

INCLUDE "https://github.com/docker-library/ruby/raw/master/2.2/wheezy/Dockerfile"

INCLUDE "https://raw.githubusercontent.com/dockerfile/java/master/oracle-java8/Dockerfile"

m5.bash

#!/bin/bash

[[ $2 = "--sub" ]] && SUB=true || SUB=false

if [[ $1 == http* ]] ; then
	if hash wget 2>/dev/null ; then
		wget –quiet -O - -o /dev/null $1
    else
        curl –silent -kL $1 2>/dev/null
    fi
else
	cat $1
fi | sed '$a\' | while read line
do

	if [[ $SUB = true && $line =~ ^FROM\ .+ ]]
		then
	#if the line is from a sub file and starts with a from
  	#quote the line
  
         echo "#$line"
else 
	# if not (a sub file and line is a FROM) 	
	if [[ $line =~ ^INCLUDE\ \"(.+)\" ]]
  		then
  		#if the line is a include instruction
  		#quote the line
  		echo ""
  		echo "#$line #IN $1"
  		#and recursively call the script with the sub flag
  		bash $0 ${BASH_REMATCH[1]} --sub
  	else
  		#else just print the line
  		echo "$line"
  	fi
  	
  fi
done