add script to fetch correct versions of OTP/Elixir sources.

Author: Gaspar Chilingarov

get_otp_elixir_sources.sh

@@ -0,0 +1,23 @@
+#!/bin/bash
+
+CWD=$(dirname $(readlink -f $0))
+cd $CWD
+
+[ -d sources ] || mkdir sources
+
+cd $CWD/sources
+
+if [ ! -d "otp" ]; then
+	OTP_VERSION=`erl -eval 'erlang:display(erlang:system_info(otp_release)), halt().' -noshell | sed -e 's/"//g' -e 's///g'`
+	echo "Checking out Erlang/OTP $OTP_VERSION"
+	OTP_BRANCH="maint-$OTP_VERSION"
+	git clone --depth 1 -b $OTP_BRANCH https://github.com/erlang/otp.git 
+fi
+
+if [ ! -d "elixir" ]; then
+	ELIXIR_VERSION=`elixir -v | awk '/^Elixir/ {print $2}'`
+	ELIXIR_TAG="v${ELIXIR_VERSION}"
+
+	echo "Checking out Elixir $ELIXIR_VERSION"
+	git clone --depth 1 -b $ELIXIR_TAG https://github.com/elixir-lang/elixir.git
+fi