Info Log Message breaks usage with docker-machine driver

[grieshaber]

Description

When using Gitlab-Runner with docker-machine executor and the ionoscloud docker-machine driver as the provider, the usage of created machines will break.
The gitlab-runner calls the getURL Method (https://github.com/ionos-cloud/docker-machine-driver/blob/master/ionoscloud.go#L1004), which then calls getIP - within the getIP Method, a info log message is created (Using IP x.x.x.x to connect). The calling function in gitlab-runner parses the complete stdout, which is produced by the called function - including the info log message.

This results in a corrupt docker host information:

tcp://x.x.x.x:2376\n(runner) Using IP x.x.x.x to connect)

.. leading to errors, when the runners tries to add the docker container on the remote vm.

Within the corresponding gitlab-runner code, it uses the plain go os/exec package, to run the following command

docker-machine url <name>

which returns the complete stdout as the result of the cmd invocation.

Expected behavior

I expect the getURL() method to return the correct host (tcp://x.x.x.x:2376) - nothing more, nothing less, so that the gitlab-runner is able to parse the stdout information as needed.

Environment

Go Version:

1.20.5

Docker Machine version:

docker-machine version 0.16.2-gitlab.22, build 0420c703

Docker Machine Driver Ionos Cloud version:

v7.0.0

OS:

Ubuntu 22.04

How to Reproduce

Steps to reproduce the behavior:

1. Install docker-machine
2. Install ionos docker-machine driver
3. Create machine
4. run docker-machine url <name>

References

https://gitlab.com/gitlab-org/gitlab-runner/-/blob/main/helpers/docker/machine_command.go?ref_type=heads#L204

[grieshaber]

for ref. #96