Issue bootBuildImage does not seem to support ssh protocol in DOCKER_HOST

How to reproduce this issue? Run DOCKER_HOST="ssh://pi@192.168.1.1" ./gradlew bootBuildImage

What is expected outcome? Buildpacks build image into the remote machine

What is the current outcome?

➜  DOCKER_HOST="ssh://pi@192.168.1.1" ./gradlew bootBuildImage    

> Task :webservice:bootBuildImage FAILED
Building image 'docker.io/library/webservice:0.0.1-SNAPSHOT'

 > Pulling builder image 'docker.io/paketobuildpacks/builder:base' ..................................................

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':webservice:bootBuildImage'.
> Connection to the Docker daemon at 'pi@192.168.1.1' failed with error "pi@192.168.1.1: Name or service not known"; ensure the Docker daemon is running and accessible

More information Remote daemon works just fine

✗ DOCKER_HOST="ssh://pi@192.168.1.1" docker info 
Client:
 Debug Mode: false

Server:
 Containers: 8
  Running: 4
  Paused: 0
  Stopped: 4
 Images: 44
 Server Version: 19.03.13
 Storage Driver: overlay2
....

Spring Boot: 2.4.0

Comment From: scottfrederick

You are correct @ruXlab, the SSH protocol is not currently supported for communicating with a Docker host using the Gradle or Maven plugin. When a URL is provided by DOCKER_HOST only the host and port fields of the address are used, and the transport is always assumed to be TCP.

Supporting SSH requires an additional layer on top of the TCP transport as well as some additional configuration to provide a private authentication key. We can consider adding this support in a future Spring Boot release.

Comment From: weltonrodrigo

The following workaround can be used to build with remote docker over SSH:

Open connection to remote server forwarding a unix sock: ssh dockervm -L$HOME/remote-docker.sock:/var/run/docker.sock

Run the build: DOCKER_HOST=unix://$HOME/remote-docker.sock mvn spring-boot:build-image

Comment From: Toparvion

@weltonrodrigo , thank you for the workaround! Is there a way to do the same on Windows?

@scottfrederick , is this feature is still planned to be done? Meanwhile, it seems sensible to note the absence of SSH support in Spring Boot Gradle Plugin documentation because it was quite frustrating for me to make everything work with SSH but finally find out that the plugin doesn't support this configuration.

Comment From: weltonrodrigo

@weltonrodrigo , thank you for the workaround! Is there a way to do the same on Windows?

I have no idea. Maybe in WSL the same will work.