Question: Already defined dependency makes buf generate failed

[boy-oo]

It looks like importing github.com/grpc-ecosystem/grpc-gateway/v2/runtime in the code makes buf return a warning. The warning that I receive looks like this:

...
protoc-gen-openapiv2/options/openapiv2.proto:719:7:symbol "grpc.gateway.protoc_gen_openapiv2.options.Scopes.ScopeEntry.key" already defined at vendor/github.com/grpc-ecosystem/grpc-gateway/v2/protoc-gen-openapiv2/options/openapiv2.proto:719:7
protoc-gen-openapiv2/options/openapiv2.proto:719:15:symbol "grpc.gateway.protoc_gen_openapiv2.options.Scopes.ScopeEntry.value" already defined at vendor/github.com/grpc-ecosystem/grpc-gateway/v2/protoc-gen-openapiv2/options/openapiv2.proto:719:15
protoc-gen-openapiv2/options/openapiv2.proto:719:23:symbol "grpc.gateway.protoc_gen_openapiv2.options.Scopes.ScopeEntry" already defined at vendor/github.com/grpc-ecosystem/grpc-gateway/v2/protoc-gen-openapiv2/options/openapiv2.proto:719:23
protoc-gen-openapiv2/options/openapiv2.proto:719:23:symbol "grpc.gateway.protoc_gen_openapiv2.options.Scopes.scope" already defined at vendor/github.com/grpc-ecosystem/grpc-gateway/v2/protoc-gen-openapiv2/options/openapiv2.proto:719:23

Is there any way to resolve this?

These are buf.yaml and buf.gen.yaml that I use:

# buf.yaml

version: v1
name: buf.build/my-squad/my-api
deps:
  - buf.build/googleapis/googleapis
  - buf.build/grpc-ecosystem/grpc-gateway
breaking:
  use:
    - FILE
lint:
  use:
    - DEFAULT

# buf.gen.yaml

version: v1
plugins:
  - plugin: go
    out: .
    opt:
      - paths=source_relative
  - plugin: go-grpc
    out: .
    opt:
      - paths=source_relative
  - plugin: grpc-gateway
    out: .
    opt:
      - paths=source_relative
      - generate_unbound_methods=true
  - plugin: openapiv2
    out: openapiv2
    opt:
      - use_go_templates=true

[bufdev]

You will need to provide us a specific, reproducible example for us to investigate - for example, create a temporary github repository and provide the exact commands for us to reproduce your issue. However, it does appear that the issue is that you have .proto files vendored at vendor/github.com/grpc-ecosystem/grpc-gateway, while you are also depending on these files via the buf.build/grpc-ecosystem/grpc-gateway dependency, meaning that the compiler is finding these files twice (which is an error). You either need to exclude vendor https://buf.build/docs/configuration/v2/buf-yaml#excludes or you need to remove the dep.

Closing this issue as I think the resolution is relatively straightforward, but if you run into difficulty, feel free to reopen if you have a reproducible example for us to investigate!