#!/usr/bin/env bash

# This script serves as the GDAL build step of the
# [**Python Buildpack**](https://github.com/heroku/heroku-buildpack-python)
# compiler.
#
# A [buildpack](http://devcenter.heroku.com/articles/buildpacks) is an
# adapter between a Python application and Heroku's runtime.
#
# This script is invoked by [`bin/compile`](/).

# The location of the pre-compiled cryptography binary.
VENDORED_GDAL="https://lang-python.s3.amazonaws.com/$STACK/libraries/vendor/gdal.tar.gz"

PKG_CONFIG_PATH="/app/.heroku/vendor/lib/pkgconfig:$PKG_CONFIG_PATH"

# Syntax sugar.
source $BIN_DIR/utils

bpwatch start gdal_install

# If GDAL exists within requirements, use vendored gdal.
if (pip-grep -s requirements.txt GDAL &> /dev/null) then

  if [ -f ".heroku/vendor/bin/gdalserver" ]; then
    export GDAL=$(pwd)/vendor
  else
    echo "-----> Noticed GDAL. Bootstrapping gdal."
    mkdir -p .heroku/vendor
    # Download and extract cryptography into target vendor directory.
    curl $VENDORED_GDAL -s | tar zxv -C .heroku/vendor &> /dev/null

    export GDAL=$(pwd)/vendor
  fi
fi

bpwatch stop gdal_install
