Writes the SOURCE_VERSION variable (usually the Git SHA) to a file for use by the app.
Created by @sreid out of the need to show which Git commit version of an app was running on a Heroku instance. Made possible by the addition of the SOURCE_VERSION variable during the build process. This variable is available during the build process, but not available to a running app, making this approach neccessary. Suggestions and improvements appreciated!
To use this buildpack, the app should already be successfully running the multi buildpack.
Then just add this buildpack in addition to the existing buildpacks in the .buildpacks file:
https://github.com/sreid/heroku-buildpack-sourceversion.git
In the application code, read the .source_version file that will be created on deployment. For example, in a Rails, it might look something like:
git_sha = File.read(Rails.root.join('.source_version'))
(add any error handling for environments where this file doesn't exist, such as your development machine, of course...)
MIT