Displaying logs from when calling external commands from a powershell script

In a powershell module there is a class with the following method (here simplified). It simply calls docker to automatically build an image.

Everything works and the image is correctly built. What I cannot understand is why the logs from docker are not printed in the console (as they do if I call the same docker command directly instead of inside a powershell module).

[void] BuildImage() {
    $imageId = ...
    docker build -f ../Dockerfile . -t $imageId
}

>Solution :

You have a void method, it produces no output. If you want to send output to the success stream (stdout), then change the return type to [string[]] and use return:

[string[]] BuildImage() {
    $imageId = ...
    return docker build -f ../Dockerfile . -t $imageId
}

If instead you’re interested in sending the output to the information stream, you can still have your void method but pipe the output from your docker command to Write-Host:

[void] BuildImage() {
    $imageId = ...
    docker build -f ../Dockerfile . -t $imageId 2>&1 |
        Write-Host
}