heroku/heroku-buildpack-python — pull request #163 by dangra (2014-08-06 15:42:55+00:00)
Title: Do not fail if buildpack dir is readonly

After this change the buildpack directory can be mounted readonly, useful for development of the buildpack itself as described in [slugbuilder#buildpacks](https://github.com/flynn/flynn/tree/master/slugbuilder#buildpacks)