Cloud Buildpacks and Cloud Build

README.md

Code for https://glasnt.com/blog/buildpack-images-as-cloud-build-steps

Setup:

chmod +x main.py
gcloud artifacts repositories create containers --repository-format docker --location us
gcloud builds submit --config build.cloudbuild.yaml

Usage:

gcloud builds submit --no-source

build.cloudbuild.yaml

steps:
  - id: build
    name: gcr.io/k8s-skaffold/pack
    args:
      - build
      - us-docker.pkg.dev/$PROJECT_ID/containers/myapp
      - "--builder=gcr.io/buildpacks/builder:v1"
      - "--network=cloudbuild"
      - "--path=."
      - "--workspace=/app"

images:
  - us-docker.pkg.dev/$PROJECT_ID/containers/myapp

cloudbuild.yaml

steps:
  # Call the image directly
  - id: default
    name: us-docker.pkg.dev/$PROJECT_ID/containers/myapp

  # Add additional args
  - id: args
    name: us-docker.pkg.dev/$PROJECT_ID/containers/myapp
    args: ["extra", "arguments"]

  # Customise the invocation within the image
  - id: launcher
    name: us-docker.pkg.dev/$PROJECT_ID/containers/myapp
    entrypoint: launcher
    args: ["python3", "main.py", "args"]

main.py

#!/usr/bin/env python

import sys

print(f"Hello I am a main.py, writing content to stdout. Invocation: {sys.argv}")

Procfile

web: ./main.py