Using a Specific Buildpack Version
While The Platform can detect and apply a buildpack automatically, Datica recommends that The Platform users pin their buildpacks to a specific version.
If the buildpack is not pinned, users run the risk that a buildpack update unexpectedly breaks their code.
How do I pin the buildpack version?
The below procedure outlines how to pin the buildpack version for your application.
1. Set the BUILDPACK_URL environment variable
The Platform selects a buildpack using the
BUILDPACK_URL environment variable. When this variable is not set, the Platform attempts to detect the needed buildpack automatically.
Every buildpack release is tagged with a version number. You can view the releases on the Github page for each buildpacks. Below is the Python buildpack for example:
Navigate to the Python Buildpack in a web browser. You’ll see the Github page. Click on the
Releases link as highlighted below:
This displays all of the buildpack releases as highlighted below.
Choose the release you want to pin. In our example, we’ll choose
v68. The buildpack URL will look like this:
Then set the URL. In this example, my environment name is
datica -E MyProdEnv vars set <service_name> -v BUILDPACK_URL="https://github.com/heroku/heroku-buildpack-python#v68"
2. Rebuild Application
This change will only take effect on the next build of the application. Builds are triggered by commits to the code service.