OCI

OCI Plug Logo

An OCI (Open Container Initiative) compliant V2 registry server implementation for Elixir. This library provides a plug-based solution that can be integrated into any Elixir web application, with configurable storage and authentication adapters.

The included adapters are nowhere near production-ready. Make sure to implement your own before you go and have a bad time.

This library is under heavy active development as we extract it from the Massdriver codebase. 0.0.x will have many breaking changes.

Features

Full OCI Distribution Specification V2 compliance
Pluggable storage backend
Configurable authentication
Easy integration with Phoenix applications
Support for Docker and OCI image formats
Compatible with Docker CLI and ORAS tools
Support for various repository naming conventions (nginx, hexpm/elixir, big-corp/big-team/big-project)

Repository Naming

This registry supports the standard OCI repository naming convention with strict namespace/name, org/team/project, or whatever wild ass / party you can dream up.

✅ myapp - Single-level names
✅ myorg/myapp - Standard namespace/name format
✅ org/team/project - Multi-level namespaces
IT CAN JUST KEEP GOING (I THINK)

Installation

The package can be installed by adding oci to your list of dependencies in mix.exs:

def deps do
  [
    {:oci, "~> 0.0.3"}
  ]
end

Usage

Basic Phoenix Integration

See an example in the test setup.

config/config.ex

config :oci,
  max_manifest_size: 4 * 1024 * 1024,
  max_blob_upload_chunk_size: 10 * 1024 * 1024,
  enable_blob_deletion: true,
  enable_manifest_deletion: true,
  repo_name_pattern: ~r/^([a-z0-9]+(?:[._-][a-z0-9]+)*)(\/[a-z0-9]+(?:[._-][a-z0-9]+)*)*$/
  storage: [
    adapter: OCI.Storage.Local,
    config: [
      path: "./tmp/"
    ]
  ]

endpoint.ex

defmodule Endpoint do
  @moduledoc false
  use Phoenix.Endpoint, otp_app: :oci

  plug(Plug.Parsers,
    parsers: [OCI.Plug.Parser, :json], # <- stick this bad boi in here. It&#39;ll full body read blob uploads and parse/digest manifests.
    pass: ["*/*"],
    json_decoder: Jason,
    length: 20_000_000
  )

  plug(TestRegistryWeb.Router)
end

router.ex:

use Phoenix.Router
import OCI.PhoenixRouter

scope "/v2" do
  forward("/", OCI.Plug, [])
end

ORAS CLI Interaction

# Push an artifact
oras push localhost:5000/myorg/myapp:latest ./my-artifact.txt

# Pull an artifact
oras pull localhost:5000/myorg/myapp:latest

Docker CLI Interaction

# Pull an image
docker pull localhost:5000/myorg/myapp:latest

# Push an image
docker push localhost:5000/myorg/myapp:latest

# List tags
curl -X GET http://localhost:5000/v2/myorg/myapp/tags/list

Custom Storage Adapter

TODO See adapter and local fs example

Custom Authentication

TODO See adapter and basic/static example

Development

Running Tests

This will run basic plug tests and the conformance suite against a phoenix endpoint.

mix test

Contributing

Fork the repository
Create your feature branch (git checkout -b my-new-feature)
Commit your changes (git commit -am 'Add some feature')
Run the QA suite to ensure quality (mix qa)
Push to the branch (git push origin my-new-feature)
Create new Pull Request

License

This project is licensed under the Apache License 2.0 - see the LICENSE file for details.

OCI