docker-compose-update-action

Github Action to update docker images from a docker-compose.yml file and push to a repository.

Given a docker-compose.yml file like this:

    web:
        image: harvardlil/capstone:10-efd312bc82881d1da5ef46cebce39b4c
    db:
        image: harvardlil/capstone-db:0.2-d8509b42e874e7d71bdb89edf5e7e01b

And a docker-compose.override.yml like this:

    services:
        web:
            build:
                context: .
                x-bake:
                    tags:
                        - harvardlil/capstone:10-efd312bc82881d1da5ef46cebce39b4c
                x-hash-paths:
                    - foo.txt
        db:
            build:
                context: .
                x-bake:
                    tags:
                        - harvardlil/capstone-db:0.2-d8509b42e874e7d71bdb89edf5e7e01b
                x-hash-paths:
                    - bar.txt

Use this action like this:

  - name: Rebuild docker images if necessary
    uses: harvard-lil/docker-compose-update-action@main

For each service with an x-hash-paths section in docker-compose.override.yml, the action will:

• Hash the contents of the build section of the docker-compose.override.yml service, the Dockerfile, and the files specified in the x-hash-paths section.
• Compare the hash to the hash in the tags section of the docker-compose.override.yml service.
• If the hashes do not match, update the version number and hash in both the docker-compose.yml and docker-compose.override.yml files.
• If the new tag does not exist in the container registry, rebuild.

By default the action will load new images to the local docker cache. If you want to push the images to the registry instead, add bake-action: push and registry credentials. The event name must be push for this to work:

  - name: Rebuild docker images if necessary
    uses: harvard-lil/docker-compose-update-action@main
    with:
      registry: docker.io
      registry-user: ${{ secrets.REGISTRY_USER }}
      registry-pass: ${{ secrets.REGISTRY_TOKEN }}
      bake-action: push

Outputs:

• services-rebuilt: the list of services with updated tags, e.g. "web db".