This repo is an example that reproduces the following:
11:11:48.11 [ERROR] 1 Exception encountered:
Engine traceback:
in `export-codegen` goal
ProcessExecutionFailure: Process 'Build Go gRPC protobuf plugin for `protoc`.' failed with exit code 1.
stdout:
stderr:
go: google.golang.org/grpc/cmd/protoc-gen-go-grpc@v1.2.0: loading deprecation for google.golang.org/grpc/cmd/protoc-gen-go-grpc: module lookup disabled by GOPROXY=off
Use `--keep-sandboxes=on_failure` to preserve the process chroot for inspection.
So, export-codegen doesn't work. Also, the docs describe that Pants auto-regenerates any protobuf output. But doesn't. If you remove the pkg/person.pb.go file, and run pants test :: tests fail. If you run protoc --go_out=. --go_opt=paths=source_relative person.proto (in pkg), tests are good again.