False positive error message `Invalid containerPort: ...`

[31z4]

Having the following Dockerfile

FROM openjdk:8-jre-alpine
ENV ZOO_PORT=2181
EXPOSE $ZOO_PORT

I get an error message Invalid containerPort: $ZOO_PORT which is incorrect, since environment variables are supported by the following list of instructions in the Dockerfile:

• ADD
• COPY
• ENV
• EXPOSE
• FROM
• LABEL
• STOPSIGNAL
• USER
• VOLUME
• WORKDIR
  as well as:
• ONBUILD (when combined with one of the supported instructions above)

[rcjsuen]

Thank you very much for your bug report, @31z4. I have opened rcjsuen/dockerfile-language-server#192 to track this problem in the language server.

[rcjsuen]

This can be closed since #173 has been merged.

[chemidy]

With the last version 0.0.23, it's not resolved.

[dockerfile-lsp] Invalid containerPort:

FROM scratch
ARG GRPC_PORT
EXPOSE $ZOO_PORT

[rcjsuen]

Hi @chemidy, if you use the Dockerfile that was originally posted, you shouldn't get any errors.

In the Dockerfile you have provided, you defined an argument named GRPC_PORT but your EXPOSE instruction is using $ZOO_PORT. Did you make a copy/paste error? Is this the Dockerfile you intended to write in your comment?

FROM scratch
ARG GRPC_PORT
EXPOSE $GRPC_PORT

[rcjsuen]

In any case, I have opened rcjsuen/dockerfile-language-server#199 for the problem that you have found regarding build arguments with no default values.

Thank you for the bug report!

[chemidy]

Hi @rcjsuen , yes it was a copy/paste error. Thks for the bug report

[rcjsuen]

@chemidy Thanks again for the bug report. I've published a new version of the language server to npm and updated #198 to include the new release.

[rcjsuen]

@chemidy Please update to 0.0.24 for a fix to the problem you reported. Thanks again for the bug report!