Autoformatting breaks Dockerfile with heredoc

[wedi]

Using the new heredoc syntax in Dockerfiles used to trigger error messages in VS Code but autoformatting did not interfere with it. Unfortunately this has changed (unfortunately I cannot tell when): since some time autoformatting indents the end marker and following lines which makes it impossible to use autoformatting on save.

This dockerfile

# syntax=docker/dockerfile:1.3-labs
FROM alpine
RUN <<EOF
    echo "Heredocs! Finally!"
EOF
CMD ["sh", "-c", "sleep 5"]

becomes

# syntax=docker/dockerfile:1.3-labs
FROM alpine
RUN <<EOF
    echo "Heredocs! Finally!"
    EOF
    CMD ["sh", "-c", "sleep 5"]

after formatting.

[rcjsuen]

@wedi Thanks for the bug report.

For a workaround, you can set the "docker.languageserver.formatter.ignoreMultilineInstructions" preference to true. See #2976.

[wedi]

Thanks! I definitely prefer fixing multiline commands myself over fixing the dockerfile in an external editor. :)

[bwateratmsft]

@rcjsuen do you want to create an issue in https://github.com/rcjsuen/dockerfile-language-server-nodejs for this? Or keep it here?

[rcjsuen]

@rcjsuen do you want to create an issue in https://github.com/rcjsuen/dockerfile-language-server-nodejs for this?

I've opened rcjsuen/dockerfile-utils#105 to track this.

[bwateratmsft]

Sounds good. Since there's a workaround and we pick up the latest language server regularly I'll close this one.

[bwateratmsft]

This is now released in Docker extension version 1.19.0.