Dockerfile linting error in FROM

[rodynnz]

If your FROM contains a port in the registry host section, the linting throws an error in the tag section.

Example to reproduce:

FROM example.registry.com:12345/base/image:1.0.0

Error shown:

[dockerfile-utils] Invalid reference format

Versions affected:

• Visual Studio Code 1.23.1 (April 2018)
• Docker 0.0.27

[rcjsuen]

Hi, @rodynnz. Thank you for your bug report. I identified this error a few days ago and have already opened rcjsuen/dockerfile-utils#39.

Regarding private registries, is the lack of a port number also valid? Will the Docker Engine query a default port with the registry API?

# is this Dockerfile valid?
FROM example.registry.com/base/image:1.0.0

[rodynnz]

Yeah sure, port is optional and follow the rules for HTTP/S connections (ports 80 or 443 are default ones)

[rcjsuen]

@rodynnz Cool, thanks for the info! I'll look into correcting my parser... :)

[StephenWeatherford]

@rodynnz This has been fixed and will be available in the next release.

[StephenWeatherford]

@rodynnz Just wanted to let you know that we have published a new version of the Docker extension that should contain this fix. Happy coding!