--chmod support for COPY and ADD

[thernstig]

In docker engine 20.10 support for the --chmod flag has been added. Trying to use it in a Dockerfile gives:

Unknown flag: chmoddockerfile-utils(40)

It would be nice to add support for it.

[bwateratmsft]

@thernstig I haven't been able to find any documentation about this flag, even in the release notes. Do you have any docs about it? Thanks!

[thernstig]

See here moby/buildkit#1492 (comment). They just forgot to add it to the release notes.

[bwateratmsft]

Thanks!

Where are you seeing the above error? I did not get any intellisense for --chmod, but there was no error either.

I got the error to appear. @rcjsuen it seems this was a rather stealthy addition from Docker; can you add support for it in the language server?

[rcjsuen]

@rcjsuen it seems this was a rather stealthy addition from Docker; can you add support for it in the language server?

Yeah. There are a few different pieces to supporting a new flag but I'll start by making sure it is ignored by the linting process.

[rcjsuen]

@bwateratmsft I've published version 0.3.0 of the language server to stop flagging the --chmod flag as an error for both ADD and COPY instructions.

[bwateratmsft]

Awesome! Thanks @rcjsuen!

[rcjsuen]

@bwateratmsft Thanks for getting the fix merged in and thank you @thernstig for letting me know about this issue!

[bwateratmsft]

This is now released in Docker extension version 1.10.0.