dagger/pkg/universe.dagger.io/README.md

Europa Universe

About this directory

europa-universe/ is a staging area for the upcoming universe.dagger.io package namespace, which will be shipped as part of the Europa release.

What is Universe?

The Dagger Universe is a catalog of reusable Cue packages, curated by Dagger but possibly authored by third parties. Most packages in Universe contain reusable actions; some may also contain entire configuration templates.

The import domain for Universe will be universe.dagger.io. It will deprecate the current domain alpha.dagger.io.

Where is the dagger package?

Europa will also introduce a new package for the Dagger Core API: dagger.io/dagger. This is a core package, and is not part of Universe (note the import domain).

The development version of the Europa core API can be imported as alpha.dagger.io/europa/dagger.

Where is the dagger/engine package?

Europa will also introduce a new package for the Low-Level Dagger Engine API : dagger.io/dagger/engine. This is a core package, and is not part of Universe (note the import domain).

The development version of the Europa Low-Level Engine API can be imported as either:

• alpha.dagger.io/europa/dagger/engine/spec/engine for the full spec
• alpha.dagger.io/dagger/europa/engine for the implemented subset of the spec

Universe vs other packages

This table compares Dagger core packages, Dagger Universe packages, and the overall CUE package ecosystem.

	Dagger core	Dagger Universe	CUE ecosystem
Import path	dagger.io	universe.dagger.io	Everything else
Purpose	Access core Dagger features	Safely reuse code from the Dagger community	Reuse any CUE code from anyone
Author	Dagger team	Dagger community, curated by Dagger	Anyone
Release cycle	Released with Dagger engine	Released continuously	No release cycle
Size	Small	Large	Very large
Growth rate	Grows slowly, with engine features	Grows fast, with Dagger community	Grows even faster, with CUE ecosystem

Notable packages

Docker API

Import path: universe.dagger.io/docker

The docker package is a native Cue API for Docker. You can use it to build, run, push and pull Docker containers directly from Cue.

The Dagger container API defines the following types:

• #Image: a container image
• #Run: run a command in a container
• #Push: upload an image to a repository
• #Pull: download an image from a repository
• #Build: build an image

Examples

Import path: universe.dagger.io/examples

This package contains examples of complete Dagger configurations, including the result of following tutorials in the documentations.

For example, the todoapp example corresponds to the Getting Started tutorial

TODO LIST

• Support native language dev in docker.#Run with good DX (Python, Go, Typescript etc.)
• Coding style. When to use verbs vs. nouns?
• Easy file injection API (container.#Image.files ?)
• Use file injection instead of inline for #Command.script (to avoid hitting arg character limits)
• Organize universe packages in sub-categories?