heroku-buildpack-rgeo-prep

by trailheadlabs

GitHub Readme.md

heroku-buildpack-rgeo-prep

This buildpack overwrites Heroku's default .bundle/config to set BUNDLE_BUILD__RGEO to Heroku's build directory.

Setup

Create this .buildpacks file in the root of your project.

https://github.com/trailheadlabs/heroku-buildpack-vendorbinaries.git
https://github.com/trailheadlabs/heroku-buildpack-rgeo-prep.git
https://github.com/heroku/heroku-buildpack-ruby.git

Create this .vendor_urls file in the root of your project.

http://trailheadlabs.outerspatial.s3.amazonaws.com/buildpack.binaries/libjpeg-9a.tar.gz http://trailheadlabs.outerspatial.s3.amazonaws.com/buildpack.binaries/gdal-1.10.1-1.tar.gz http://trailheadlabs.outerspatial.s3.amazonaws.com/buildpack.binaries/proj-4.8.0-1.tar.gz http://trailheadlabs.outerspatial.s3.amazonaws.com/buildpack.binaries/geos-3.4.1.tar.gz

Add these files to git.

Now, set up your heroku configuration.

heroku config:set BUILDPACK_URL=https://github.com/trailheadlabs/heroku-buildpack-multi.git LD_LIBRARY_PATH=/app/lib

heroku config:set GDAL_BIN=/app/bin

heroku config:set GDAL_DATA=/app/share/gdal

If you haven't already set up your heroku database for postgis, you need to run the following steps. You currently must have a production level database to enable postgis.

Since postgis uses different settings in the database.yml, you need to modify the DATABASE_URL variable. Run the following command and extract the nessecary components out of it:

$ heroku config:get DATABASE_URL 
postgres://<username>:<password>@<host>:<port>/<database>

With those variables, run the following command

$ heroku config:set DATABASE_URL="postgis://<username>:<password>@<host>:<port>/<database>?postgis_extension=true&search_schema_path=public,postgis"

Enable PostGIS

$ heroku pg:psql
=> CREATE EXTENSION postgis;

Deploy

git push heroku master

Verify it worked

heroku run bash
~> bundle exec rails c

>> RGeo::Geos.supported?
=> true
>> RGeo::CoordSys::Proj4.supported?
=> true

If both of these are true, you should be ready to go.

libjpeg

In order to get ogr2ogr geojson to shapefile conversion to work I had to build a custom version of the libjpeg binaries.

I started with the libjpgeg 9a source tarball and built that as per the normal heroku binary vendoring process.

The major hack is that after make installing the binaries I had to create a symbolic link in the lib directory for libjpeg.so.62 to work. Then I tarred that up and put it on S3 for vendor_urls.

Tools

We found the heroku repo plugin to be useful during the debugging process :

https://github.com/heroku/heroku-repo

Running the following commands let us clear out the buildpacks so that we could ensure any changes we made would be used in the next deploy:

heroku repo:purge_cache

heroku repo:reset

Credits

This is really just a fork for use in Trailhead Labs applications of :

This solution draws from many people's research including