add protoc-gen-swift to Makefile to update proto files for opentelemetry-swift

[vvydier]

I would like to add a gen-swift task in the Makefile, so we can update the protobuf files for opentelemetry-swift when a change happens in the proto repo:
How do I add the swift's protoc (https://github.com/apple/swift-protobuf) in the build process. Looks like its using the docker image otel/build-protobuf . I get this error when I run make gen-swift

Please specify a program using absolute path or make sure the program is available in your PATH system variable
--swift_out: protoc-gen-swift: Plugin failed with status code 1.
make: *** [gen-swift] Error 1

The build is using a docker image otel/build-protobuf:0.9.0 which has protoc for other languages but not one for swift. How do I add swift's protoc (https://github.com/apple/swift-protobuf) so we can use it to build the protobuf files for swift as well?

Thanks

[bogdandrutu]

@vvydier the docker image that we use is generated from https://github.com/open-telemetry/build-tools/tree/main/protobuf, so go ahead and change the Dockerfile to include swift support.

[tigrannajaryan]

This looks stale. Is this still in progress?

[vvydier]

I didnt realize that I had already requested the protoc compiler addition in the Dockerfile some time back.
What do I need to get this approved and be added so we can compile protobuf files for the opentelemetry-swift project whenever there is an update. THanks

[vvydier]

The docker image for build is based on alpine linux https://github.com/open-telemetry/build-tools/blob/main/protobuf/Dockerfile#L1 and there is no distribution of swift on alpine linux. There is swift for ubuntu, centos and amazon linux https://www.swift.org/blog/additional-linux-distros/ so this method will not work for using the grpc-plugin for swift, unbless we switch to a docker that uses a base image that swift is supported on. @tigrannajaryan