60 lines
3.2 KiB
Markdown
60 lines
3.2 KiB
Markdown
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# Europa Core packages
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## About this directory
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`stdlib/europa/` holds the development version of the Core packages for the upcoming [Europa release](https://github.com/dagger/dagger/issues/1088).
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Once Europa is released, `stdlib/europa` will become the new `stdlib/`
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## What are Dagger core packages?
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Dagger core packages are CUE packages released alongside the Dagger engine, to allow developers to access its features.
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### Dagger Core API: `dagger.io/dagger`
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*Development import path: `alpha.dagger.io/europa/dagger`*
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The Dagger Core API defines core types and utilities for programming Dagger:
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* `#Plan`: a complete configuration executable by `dagger up`
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* `#FS` to reference filesystem state
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* `#Secret` to (securely) reference external secrets
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* `#Service` to reference network service endpoints
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* `#Stream` to reference byte streams
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### Low-level Engine API: `dagger.io/dagger/engine`
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* *Development import path (implemented subset): `alpha.dagger.io/europa/dagger/engine`*
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* *Development importa pth (full spec): `alpha.dagger.io/dagger/europa/dagger/engine/spec/engine`*
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`engine` is a low-level API for accessing the raw capabilities of the Dagger Engine. Most developers should use the Dagger Core API instead (`dagger.io/dagger`), but experts and framework developers can target the engine API directly for maximum control.
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This API prioritizes robustness, consistency, and feature completeness. It does NOT prioritize developer convenience or leveraging Cue for composition.
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In Europa, `engine` will deprecate the following implicit API:
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* Low-level operations defined in `alpha.dagger.io/dagger/op`
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* Imperative DSL to assemble Dockerfile-like arrays as Cue arrays
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* Convention to embed pipelines in the Cue lattice with the special nested definition `#up`
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* Convention to reference filesystem state from the Cue lattice with `@dagger(artifact)`
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* Convention to reference external secrets from the Cue lattice with `@dagger(secret)`
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* Convention to reference external network endpoints from the Cue lattive with `@dagger(stream)`
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* Convention that some operations (specifically `op.#Local`) are meant to be generated at runtime rather than authored manually.
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## TODO LIST
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* #Scratch: replace with null #FS?
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* Resolve registry auth special case (buildkit does not support scoping registry auth)
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* Are there runtime limitations in….
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* using hidden fields `_foo` as part of the DAG?
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* using `if` statements as part of the DAG?
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* using inlined Cue expressions as part of the DAG?
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* Readability of error messages
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* At a minimum don’t make it worse!
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* Small improvements are good (eg.
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* Make sure we don’t make error messages LESS readable
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* [Outstanding questions on proxy features](https://github.com/dagger/dagger/pull/1117#discussion_r765211280)
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* [Outstanding questions on #Stream and emulating unix pipes with them](https://github.com/dagger/dagger/pull/1117#discussion_r766145864)
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* [Outstanding questions on engine.#Pull and information loss](https://github.com/dagger/dagger/pull/1117#discussion_r765219049)
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* [Outstanding questions on global registry auth scope in buildkit](https://github.com/dagger/dagger/pull/1117#discussion_r765963051)
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* [Outstanding questions on platform key](https://github.com/dagger/dagger/pull/1117#discussion_r766085610)
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