Hello World scenario fixed

[oliverbarnes]

As it was discussed a while back, the decidim/decidim:latest image up on Docker Hub isn't working with the proposed "Hello World" docker-compose flow, because the image is an app generator, and not an app instance. The details are discussed thoroughly on that thread, so I'll skip them.

With the recent changes that were merged (#50), the generator image is now called decidim-generator, to avoid this confusion, and the decidim image is now based on Dockerfile-deploy. Dockerfile-deploy itself was updated to fix the following error:

➜ docker run -it --rm \
  -e DATABASE_USERNAME=postgres \
  -e DATABASE_PASSWORD=postgres \
  -e DATABASE_HOST=host.docker.internal \
  -e RAILS_ENV=development \
  -p 3000:3000 \
  decidim/decidim:latest-deploy
Could not locate Gemfile or .bundle/ directory

The update and fix was to generate the Decidim app within the build process, and remove the ONBUILD commands. I'm now able to get the app up and running smoothly locally. Here are the steps with an existing local postgres database, without using docker-compose so it's transparent what's going on. I'm not posting the output, but db setup, migrations and seeding all run smoothly.

docker run -it --rm \
  -e DATABASE_USERNAME=postgres \
  -e DATABASE_PASSWORD=postgres \
  -e DATABASE_HOST=host.docker.internal \
  -e RAILS_ENV=development \
  -p 3000:3000 \
  ghcr.io/decidim/decidim:latest bundle exec rake db:setup

docker run -it --rm \
  -e DATABASE_USERNAME=postgres \
  -e DATABASE_PASSWORD=postgres \
  -e DATABASE_HOST=host.docker.internal \
  -e RAILS_ENV=development \
  -p 3000:3000 \
  ghcr.io/decidim/decidim:latest bundle exec rake db:migrate

docker run -it --rm \
  -e DATABASE_USERNAME=postgres \
  -e DATABASE_PASSWORD=postgres \
  -e DATABASE_HOST=host.docker.internal \
  -e RAILS_ENV=development \
  -p 3000:3000 \
  ghcr.io/decidim/decidim:latest bundle exec rake db:seed

docker run -it --rm \
  -e DATABASE_USERNAME=postgres \
  -e DATABASE_PASSWORD=postgres \
  -e DATABASE_HOST=host.docker.internal \
  -e RAILS_ENV=development \
  -p 3000:3000 \
  ghcr.io/decidim/decidim:latest

Notes:

• host.docker.internal is just how Docker for mac accesses localhost on the host machine, this wouldn't be needed on linux.

To sum it up

The Hello World scenario is fixed, but with a different dev experience. We'll need to update documentation, and decide we want to use docker-compose to also offer to spin up the db for the dev user.

[oliverbarnes]

Update: the new decidim-generator and decidim images are now published on Github Container Registry: https://github.com/orgs/decidim/packages/container/package/decidim

They will be mirrored on Docker Hub but there's some configuration pending in order to do so.

[oliverbarnes]

#78 now adds a docker-compose "Hello World" as well:

git clone [email protected]:decidim/docker.git decidim-docker
cd decidim-docker
docker-compose up