.NET Core SDK Cloud Native Buildpack

The .NET Core SDK CNB provides a version of the .NET Core SDK and a version of the .NET Core Driver or the dotnet binary. It also sets the .NET Core SDK on the$DOTNET_ROOT so that it is available to subsequent buildpacks during their build phase and sets the .NET Core Driver on the $PATH so that is available to subsequent buildpacks and in the final running container.

Integration

The .NET Core SDK CNB provides the dotnet-sdk as a dependency. Downstream buildpacks, like .NET Core Build can require the dotnet-sdk dependency by generating a Build Plan TOML file that looks like the following:

[[requires]]

  # The name of the .NET Core SDK dependency is "dotnet-sdk". This value is considered
  # part of the public API for the buildpack and will not change without a plan
  # for deprecation.
  name = "dotnet-sdk"

  # The version of the .NET Core SDK dependency is not required. In the case it
  # is not specified, the buildpack will provide the default version, which can
  # be seen in the buildpack.toml file.
  # If you wish to request a specific version, the buildpack supports
  # specifying a semver constraint in the form of "6.*", "6.0.*", or even
  # "6.0.1".
  version = "6.0.1"

  # The .NET Core SDK buildpack supports some non-required metadata options.
  [requires.metadata]

    # Setting the build flag to true will ensure that the .NET Core SDK
    # depdendency is available in the $DOTNET_ROOT for subsequent buildpacks during
    # their build phase and ensures that the .NET Core Driver dependency is available
    # in the $PATH for subsequent buildpacks. If you are writing a buildpack that needs
    # to use the dotnet sdk & driver during its build process, this flag should be set
    # to true.
    build = true

Configuration

BP_DOTNET_SDK_VERSION

The BP_DOTNET_SDK_VERSION variable allows you to specify the version of SDK that is installed. This overrides any configuration set in global.json. The environment variable can be set at build-time either directly (ex. pack build my-app --env BP_ENVIRONMENT_VARIABLE=some-value) or through a project.toml file

BP_DOTNET_SDK_VERSION=8.0.*

BP_LOG_LEVEL

The BP_LOG_LEVEL variable allows you to configure the level of log output from the buildpack itself. The environment variable can be set 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"

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.