Export env variables into exports so next buildpack can use it

bin/compile

@@ -15,12 +15,16 @@ S3_BUCKET=${HEROKU_GEO_BUILDBACK_S3_BUCKET:-"heroku-buildpack-geo"}
 
 # Parameters
 BUILD_DIR=$1
+BP_DIR=$(cd $(dirname ${0:-}); cd ..; pwd)
 CACHE_DIR="${2}/${STACK}"
 
 # Setup profile file
 PROFILE_PATH="$BUILD_DIR/.profile.d/geo.sh"
 mkdir -p $(dirname $PROFILE_PATH)
 
+# Set up exports file
+EXPORTS_PATH="$BP_DIR/export"
+
 # Functions
 function indent() {
   c='s/^/       /'
@@ -52,6 +56,10 @@ function set-default-env (){
   echo "export $1=\${$1:-$2}" >> $PROFILE_PATH
 }
 
+function set-export (){
+  echo "export $1=$2" >> $EXPORTS_PATH
+}
+
 # Retrieve versions
 GEOS_VERSION=$(manifest_version "geos")
 GDAL_VERSION=$(manifest_version "gdal")
@@ -96,13 +104,18 @@ for dir in $VENDORED_GEOS $VENDORED_GDAL $VENDORED_PROJ; do
 done
 
 # App directories
-APP_VENDOR="$BUILD_DIR/$TARGET_VENDOR_DIR"
-
-# Setup environment variables
-set-env GEOS_LIBRARY_PATH "$APP_VENDOR/lib"
-set-env GDAL_LIBRARY_PATH "$APP_VENDOR/lib"
-set-env PROJ4_LIBRARY_PATH "$APP_VENDOR/lib"
-set-env GDAL_DATA "$APP_VENDOR/share/gdal"
+APP_VENDOR_RUNTIME="$\HOME/$TARGET_VENDOR_DIR"
+APP_VENDOR_BUILD="$BUILD_DIR/$TARGET_VENDOR_DIR"
+
+# Setup environment variables needed to run the app
+set-env GEOS_LIBRARY_PATH "$APP_VENDOR_RUNTIME/lib"
+set-env GDAL_LIBRARY_PATH "$APP_VENDOR_RUNTIME/lib"
+set-env PROJ4_LIBRARY_PATH "$APP_VENDOR_RUNTIME/lib"
+set-env GDAL_DATA "$APP_VENDOR_RUNTIME/share/gdal"
+set-default-env LIBRARY_PATH "$APP_VENDOR_RUNTIME/lib"
+set-default-env LD_LIBRARY_PATH "$APP_VENDOR_RUNTIME/lib"
+set-default-env CPATH "$APP_VENDOR_RUNTIME/include"
+set-default-env PATH "$APP_VENDOR_RUNTIME/bin"
 
 # Bundle workaround
 mkdir -p $BUILD_DIR/.bundle
@@ -118,9 +131,15 @@ BUNDLE_WITHOUT: development:test
 BUNDLE_DISABLE_SHARED_GEMS: '1'
 " > $BUILD_DIR/.bundle/config
 
-set-default-env LIBRARY_PATH "$APP_VENDOR/lib"
-set-default-env LD_LIBRARY_PATH "$APP_VENDOR/lib"
-set-default-env CPATH "$APP_VENDOR/include"
-set-default-env PATH "$APP_VENDOR/bin"
+# Set up environment variables needed during the remainder of
+# the build process.. These can be read by subsequent buildpacks
+set-export GEOS_LIBRARY_PATH "$APP_VENDOR_BUILD/lib"
+set-export GDAL_LIBRARY_PATH "$APP_VENDOR_BUILD/lib"
+set-export PROJ4_LIBRARY_PATH "$APP_VENDOR_BUILD/lib"
+set-export GDAL_DATA "$APP_VENDOR_BUILD/share/gdal"
+set-export LIBRARY_PATH "$APP_VENDOR_BUILD/lib"
+set-export LD_LIBRARY_PATH "$APP_VENDOR_BUILD/lib"
+set-export CPATH "$APP_VENDOR_BUILD/include"
+set-export PATH "$APP_VENDOR_BUILD/bin:\$PATH"
 
 echo "-----> Vendoring geo libraries done"