Paketo Buildpack for Bundler

gcr.io/paketo-buildpacks/bundler

The Bundler CNB provides the Bundler binary.

The buildpack installs Bundler onto the $PATH and $GEM_PATH which makes it available for subsequent buildpacks and/or in the final running container.

Integration

The Bundler CNB provides bundler as a dependency. Downstream buildpacks can require the bundler dependency by generating a Build Plan TOML file that looks like the following:

[[requires]]

  # The name of the Bundler dependency is "bundler". This value is considered
  # part of the public API for the buildpack and will not change without a plan
  # for deprecation.
  name = "bundler"

  # The Bundler buildpack supports some non-required metadata options.
  [requires.metadata]

    # Use `version` to request a specific version of `bundler`.
    # This buildpack supports specifying a semver constraint in the form of "2.*", "2.1.*",
    # or even "2.1.4".
    # Optional, defaults to the latest version of `bundler` found in the `buildpack.toml` file.
    version = "2.1.4"

    # When `build` is true, this buildpack will ensure that `bundler` is available
    # on the `$PATH` and `$GEM_PATH` for later buildpacks.
    # Optional, default false.
    build = true

    # When `launch` is true, this buildpack will ensure that `bundler` is available
    # on the `$PATH` and `$GEM_PATH` for the running application.
    # Optional, default false.
    launch = true

Usage

To package this buildpack for consumption:

$ ./scripts/package.sh

This builds the buildpack's Go source using GOOS=linux by default. You can supply another value as the first argument to package.sh.

Bundler Configurations

Specifying the Bundler version through buildpack.yml configuration will be deprecated in Bundler Buildpack v1.0.0.

To migrate from using buildpack.yml please set the $BP_BUNDLER_VERSION environment variable at build time either directly (ex. pack build my-app --env BP_BUNDLER_VERSION=2.7.*) or through a project.toml file

$BP_BUNDLER_VERSION="2.1.4"

This will replace the following structure in buildpack.yml:

bundler:
  version: 2.1.4

Logging Configurations

To configure the level of log output from the buildpack itself, set the $BP_LOG_LEVEL environment variable at build time either directly (ex. pack build my-app --env BP_LOG_LEVEL=DEBUG) or through a project.toml file If no value is set, the default value of INFO will be used.

The options for this setting are:

• INFO: (Default) log information about the progress of the build process
• DEBUG: log debugging information about the progress of the build process

$BP_LOG_LEVEL="DEBUG"

Compatibility

This buildpack is currently only supported on the Paketo Bionic and Jammy stack distributions. A pre-compiled distribution of Bundler is provided for the Paketo stacks (i.e. io.buildpacks.stack.jammy and io.buildpacks.stacks.bionic).