User could be warned if an illegal image name is specified

[michael-borkowski]

Description

I have struggled for some time now with a strange problem, where mvn docker:build failed; amongst the error output, "Connection Reset" was found. I finally figured out what caused the issue: My maven project's artifact ID had upper-case letters in it, and I am using ${myPrefix}/${project.artifactId} as the image name. However, docker seems to not allow upper-case letters for images names.

Not only was I aware of this limitation, I got a confusing error message. It would increase usability and reduce frustration if a check for the repository name was performed by the plug-in, or at least the error message coming from docker (which I see in the docker logs: Handler for POST /build returned error: Invalid repository name (myProject), only [a-z0-9-_.] are allowed) somehow shown in the output.

How to reproduce

• Specify upper-case letters as an image name
• mvn package docker:build

What do you expect

An error message notifying me of the fact hat docker does not allow upper-case letters as an image name, be it coming from the plugin or from docker itself.

What happened instead

[ERROR] Failed to execute goal com.spotify:docker-maven-plugin:0.4.3:build (default-cli) on project myProject: Exception caught: java.util.concurrent.ExecutionException: com.spotify.docker.client.shaded.javax.ws.rs.ProcessingException: org.apache.http.client.ClientProtocolException: Cannot retry request with a non-repeatable request entity: Connection reset by peer -> [Help 1]

Software:

• docker version: client 1.6.2, server 1.6.2
• docker-maven-plugin version: 0.4.3
• maven version: 3.3.3

[mattnworb]

I think this is more of an issue with https://github.com/spotify/docker-client/ than this plugin. The client checks if the name of a container is valid when creating or renaming a container, but doesn't have similar checks when building an image.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.