saulshanabrook/buildpack repository overview

⁠Buildpack

A base image that allows easy extension to run Heroku like apps.

⁠Quickstart

If you have a Heroku app, just run add a Dockerfile:

FROM saulshanabrook/buildpack
CMD start web

Build it

$ docker build -t app .

...and run it

$ docker run -rm -it -p 8080:8080 app .

⁠Environmental Variables

If you want to add some environmental variables when Docker is building (for example to change the BUILDPACK_URL), just add them to a build.env file in the root of your project.

$ echo 'BUILDPACK_URL=some_crazy_buildpack' >> build.env

⁠How does it work?

I have tried to keep this as small as possible, harnessing all of the actual logic from Flynn's slugbuilder⁠ and slugrunner⁠.

I am basically copying those Dockerfiles and combinging them, so as to allow a single image to inherit from which does everything, instead of passing tarballs around of images and slugs.

Originally I wanted to use the advertised API for slugbuilder and slugrunner, to build and run the slugs inside the my Docker build, but this would require running Docker inside a Docker build, which isn't possible yet⁠

⁠Which buildpacks do you support by defaults?

The same ones supported by slugbuilder⁠

⁠Why don't you just use tutum/buildstep⁠?

I tried it and it didn't work for my project for some reason. Since Flynn has already done all the hard work, I figured it would be nice to harness their projects and build off them.