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dagger/stdlib/docker
Andrea Luzzardi 5a1d4bff62 Support loading artifacts into a Docker Engine
This adds support to loading artifacts (e.g. docker.#Build,
os.#Container, ...) into any arbitrary docker engine (through a
dagger.#Stream for UNIX sockets or SSH for a remote engine)

Implementation:
- Add op.#SaveImage which serializes an artifact into an arbitrary path
  (docker tarball format)
- Add docker.#Load which uses op.#SaveImage to serialize to disk and
  executes `docker load` to load it back

Caveats: Because we're doing this in userspace rather than letting
dagger itself load the image, the performance is pretty bad.

The buildkit API is meant for streaming (get a stream of a docker image
pipe it into docker load). Because of userspace, we have to load the
entire docker image into memory, then serialize it in a single WriteFile
LLB operation.

Example:

```cue
package main

import (
	"alpha.dagger.io/dagger"
	"alpha.dagger.io/docker"
)

source: dagger.#Input & dagger.#Artifact

dockersocket: dagger.#Input & dagger.#Stream

build: docker.#Build & {
	"source": source
}

load: docker.#Load & {
	source: build
	tag:    "testimage"
	socket: dockersocket
}
```

Signed-off-by: Andrea Luzzardi <aluzzardi@gmail.com>
2021-10-12 14:16:01 -07:00
..
compose stdlib: added support for local docker socket 2021-09-21 17:19:00 -07:00
tests added test for docker run with ports 2021-09-28 09:33:02 -06:00
command.cue stdlib: added support for local docker socket 2021-09-21 17:19:00 -07:00
docker.cue Support loading artifacts into a Docker Engine 2021-10-12 14:16:01 -07:00