Error when talking to buildkitd through docker cli

[fenollp]

Using #2843, I am able to talk to buildkitd through buildctl via SSH:

BUILDKIT_HOST=ssh://toaster ./buildctl build --frontend=gateway.v0 --opt source=docker/dockerfile --opt context=https://github.com/FuzzyMonkeyCo/monkey.git --opt build-arg:PREBUILT=1 --output=type=local,dest=$PWD/
# goes through with the build

However the equivalent docker command fails:

DOCKER_HOST=ssh://toaster  DOCKER_BUILDKIT=1 docker build -o=. --platform=local --build-arg PREBUILT=1 https://github.com/FuzzyMonkeyCo/monkey.git
[+] Building 0.0s (0/0)                                                                                                                                                                       
error: no valid drivers found: Get "http://docker.example.com/v1.24/info": net/http: HTTP/1.x transport connection broken: malformed HTTP response "\x00\x00\x06\x04\x00\x00\x00\x00\x00\x00\x05\x00\x00@\x00".
* Are you trying to connect to a TLS-enabled daemon without TLS?

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As noted in #2839 I (uninstalled docker-ce and) only have /usr/local/bin/docker:

#!/bin/sh -eu
[[ $# -ne 3 ]] && exit 3
[[ "$1" != 'system' ]] && exit 4
[[ "$2" != 'dial-stdio' ]] && exit 5
exec $HOME/bin/buildctl --addr unix:///run/user/1000/buildkit/buildkitd.sock dial-stdio

Note: I am running latest rootless buildkitd with PATH="$PATH:$HOME/bin" ~/bin/rootlesskit --net=slirp4netns --slirp4netns-sandbox=true --slirp4netns-seccomp=true --copy-up=/etc --disable-host-loopback ~/bin/buildkitd

---

Is it normal that (rootless) buildkitd is not usable directly via docker CLI?

[tonistiigi]

Docker and buildkitd have different APIs. You can't just point docker client to buildkit server. DOCKER_HOST != BUILDKIT_HOST.

What you want in here likely is to extend the docker buildx remote driver to also understand the ssh protocol. Currently it supports tcp and unix docker/buildx#1086 .

[fenollp]

Thanks! not sure why I had this assumption.