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Runtime builder image for .NET Core in GCP

This directory contains the definition for the runtime builder for the aspnetcore runtime for Google App Engine Flexible environment. The runtime builder image will generate an appropriate Dockerfile given a published .NET Core application. The image is designed to be used as a build step in a Google Cloud Build cloudbuild.yaml file, before the step to build the app's image, as it will output the Dockerfile in the app's directory.

The structure of the directory is as follows:

  • The cloudbuild.yaml file contains the instructions on how to build the image. During the build process structural and functional tests will run to ensure that the image contains the expected contents and that the main script, prepare_project.py is working as expected.
  • The pfunctional_tests directory contains stubbed .NET Core published applications, used to generate Dockerfile for various supported runtimes.
  • The functional_tests_validator directory contains the definition of a small Docker image that is to be used during the build process to validate the result of running the functional tests. The script validator.sh ensures that the produced Dockerfile files have the expected FROM and ENTRYPOINT commands.
  • The src directory contains the source for the runtime image, including the prepare_project.py which implements the logic for the runtime builder.
  • The structural_tests directory contains the structural tests for the runtime image, which verify that the contents of the image match what we expect.

To use the image you add a step to the cloudbuild.yaml that looks like this:

- name: 'gcr.io/gcp-runtimes/aspnetcorebuild:latest'
  args: [ '--version-map',
          '1.1.2=gcr.io/google-appengine/aspnetcore:1.1.2',
          '1.0.5=gcr.io/google-appengine/aspnetcore:1.0.5',
          '2.0.0=gcr.io/google-appengine/aspnetcore:2.0.0-preview1' ]

This step assumes that the root of the app is the workspace, it will inspect it and produce a Dockerfile that uses one of the provided base images depending on the version of .NET Core being targeted. The runtime builder will fail (return non-zero exit code) if the app targets a version of .NET Core that is not supported.