#!/bin/bash
set -ev

if [ -z ${LOCAL_PKG+x} ] || [ -z "$LOCAL_PKG" ]; then
    echo "LOCAL_PKG is not set. Aborting..."
    exit 1
fi

echo "=== Updating the build environment in $LOCAL_PKG ==="

#echo "=== Installing from external package sources ==="
#wget -O - http://apt.llvm.org/llvm-snapshot.gpg.key|sudo apt-key add -
#echo "deb http://apt.llvm.org/trusty/ llvm-toolchain-trusty-3.9 main" | sudo tee -a /etc/apt/sources.list
#sudo add-apt-repository -y ppa:lttng/ppa
#sudo apt-get update -qq
#sudo apt-get install -y clang-3.9 clang-tidy-3.9

echo "=== Installing python packages ==="
pip install --user cpp-coveralls

# Increase the environment version to force a rebuild of the packages
# The version is writen to the cache file after every build of the dependencies
ENV_VERSION="1"
ENV_INSTALLED=""
if [ -e $LOCAL_PKG/.build_env ]; then
    echo "=== No cached build environment ==="
    read -r ENV_INSTALLED < $LOCAL_PKG/.build_env
fi

# travis caches the $LOCAL_PKG dir. If it is loaded, we don't need to reinstall the packages
if [ "$ENV_VERSION" = "$ENV_INSTALLED" ]; then
    echo "=== The build environment is current ==="
    # Print version numbers
    clang --version
    g++ --version
    cppcheck --version
    valgrind --version
    exit 0
fi

echo "=== The build environment is outdated ==="

# Clean up
# additional safety measure to avoid rm -rf on root
# only execute it on travis
if ! [ -z ${TRAVIS+x} ]; then
    rm -rf $LOCAL_PKG/*
fi

# create cached flag
echo "=== Store cache flag ==="
echo $ENV_VERSION > $LOCAL_PKG/.build_env

# Print version numbers
echo "=== Installed versions are ==="
clang --version
g++ --version
cppcheck --version
valgrind --version