Add support for gitlab as build registry

We’re trying to use a gitlab registry as backend for build images.

The setup is done using a helm chart, and passing in the configuration:

config:
  DockerRegistry:
    token_url: "https://gitlab.cern.ch/jwt/auth"
    username: <username>
    password: <password>
  BinderHub:
    image_prefix: gitlab-registry.cern.ch/binder/images/build-
registry:
  url: "gitlab-registry.cern.ch"

After debugging the multiple authz errors, it seems to boil down to:

1. missing “service”: “container_registry” when fetching a valid token using the token_url (this is required by gitlab)
2. the build image name logic assumes a dockerhub like structure (up to two levels in the path). The gitlab registry allows more and we rely on this (see above with binder/images/actual-image-name)

I’ll push a PR soon, just figuring out the best way to make 2. generic.

[dichaelen]

Hi @rochaporto,

As of primo February 2020 is there any solution to this? Or are anybody working on it to your knowledge? We are facing the same challenge and would like to have as much input as possible, A shortterm solution is to use our legacy registry outside GitLab, but it is not sustainable.

thanks in advance!

[ctr26]

Update, it doesn’t work for finding pre built images it just successfully pushes