add "env" driver that connects to $BUILDKIT_HOST

[AkihiroSuda]

This driver allows creating a buildx instance directly pointing to the existing buildkit endpoint.

docker buildx create --driver=env unix:///var/lib/buildkitd.sock
docker buildx create --driver=env uses BUILDKIT_HOST env value with UNIX sock default.

I guess TLS info is just passed with a custom driver-opt:

docker buildx create --driver=env --driver-opt ca=mycafile.pem https://foobar

rm/stop commands are no-op in this driver.

A better name could be "remote".

[tonistiigi]

It's possible this could be combined with #21 as #21 doesn't really have an endpoint.

[tonistiigi]

Otoh, combining may add complexity as #21 is linux only and may require credentials while this could work from anywhere. It would be easier to do this split by using different drivers.

[pchico83]

+1 This would be awesome!

[Shaked]

Any updates regarding this issue? Is it there another way to run buildx with a remote buildkitd?

[developer-guy]

Hello folks, kindly ping 🙋🏻‍♂️✌️ Are there any updates? We (w/@Dentrax) thought that, if it happens, we can be able to use the buildkitd running in lima-vm for this. So, we are so excited about this.

[tonistiigi]

Nobody is working on it afaik. It should quite easy to add it If somebody wants to take it on. Most of the work would probably be to make sure that CI would test this driver.

[remidebette]

@jedevc thanks for the feature, what do you think about: docker/for-mac#6149 ?

[remidebette]

Hi @tonistiigi @jedevc ,
I wanted to work with this, but it seems there is no release containing #1078 ?

Same for https://hub.docker.com/r/docker/buildx-bin/tags

[jedevc]

The buildx-bin image has the :master tag which tracks the state of the master branch here on git - that should allow you to use the feature.

You're right, the remote driver is still not in a release of buildx yet, but it will be in the next release of buildx with v0.9. We've got a milestone of issues/prs that are targeted towards that release as well: https://github.com/docker/buildx/milestones/v0.9.0 - it's in progress.