PYTHON_VERSION=$(cat runtime.txt)

# Install Python.

if [ -f .heroku/python-version ]; then

if [ ! $(cat .heroku/python-version) = $PYTHON_VERSION ]; then

bpwatch start uninstall_python

puts-step "Found $(cat .heroku/python-version), removing"

rm -fr .heroku/python

bpwatch stop uninstall_python

else

SKIP_INSTALL=1

fi

fi

if [ ! $STACK = $CACHED_PYTHON_STACK ]; then

bpwatch start uninstall_python

rm -fr .heroku/python .heroku/python-stack .heroku/vendor

unset SKIP_INSTALL

bpwatch stop uninstall_python

fi

if [ ! "$SKIP_INSTALL" ]; then

bpwatch start install_python

puts-step "Installing $PYTHON_VERSION"

# Prepare destination directory.

mkdir -p .heroku/python

exit_code=0

url="https://lang-python.s3.amazonaws.com/$STACK/runtimes/$PYTHON_VERSION.tar.gz"

filtered_url=$($ROOT_DIR/compile-extensions/bin/download_dependency $url /tmp) || exit_code=$?

if [ $exit_code -ne 0 ]; then

$ROOT_DIR/compile-extensions/bin/recommend_dependency $url

exit 1

fi

downloaded_file=/tmp/$PYTHON_VERSION.tar.gz

tar zxvf $downloaded_file -C .heroku/python &> /dev/null

rm $downloaded_file

echo "Downloaded [$filtered_url]"

bpwatch stop install_python

# Record for future reference.

echo $PYTHON_VERSION > .heroku/python-version

echo $STACK > .heroku/python-stack

FRESH_PYTHON=true

hash -r

fi

# If Pip isn't up to date:

if [ "$FRESH_PYTHON" ] || [[ ! $(pip --version) == *$PIP_VERSION* ]]; then

WORKING_DIR=$(pwd)

bpwatch start prepare_environment

TMPTARDIR=$(mktemp -d)

trap "rm -rf $TMPTARDIR" RETURN

bpwatch start install_setuptools

# Prepare it for the real world

# puts-step "Installing Setuptools ($SETUPTOOLS_VERSION)"

tar zxf $ROOT_DIR/vendor/setuptools-$SETUPTOOLS_VERSION.tar.gz -C $TMPTARDIR

cd $TMPTARDIR/setuptools-$SETUPTOOLS_VERSION/

python setup.py install &> /dev/null

cd $WORKING_DIR

bpwatch stop install_setuptoools

bpwatch start install_pip

# puts-step "Installing Pip ($PIP_VERSION)"

tar zxf $ROOT_DIR/vendor/pip-$PIP_VERSION.tar.gz -C $TMPTARDIR

cd $TMPTARDIR/pip-$PIP_VERSION/

python setup.py install &> /dev/null

cd $WORKING_DIR

bpwatch stop install_pip

bpwatch stop prepare_environment

fi

hash -r