Requiring usage of buf breaks Rust proto build

[cbrit]

Summary of Bug

I'm hoping to PR an update to the cosmos-sdk-proto Rust crate to support v0.46.0. In the past, all third party proto package dependencies were present in the /third_party/ directory of the Cosmos SDK repo. However, now it seems with the latest version the gogo.proto and other deps are included by buf using the buf schema registry. This breaks the cosmos-sdk-proto/proto-build crate's build because it expects the third party proto dependencies to be present already. To my knowledge there isn't a Rust crate that can build protos with buf.

Workarounds I am considering include adding the files to the build crate as a dependency and copying them to third_party in the build, or having the build run a CLI command and use buf, but that seems hacky.

Wanted to raise it as a usability concern or at least get a recommended workaround?

Version

v0.46.0

Steps to Reproduce

Any attempt to build that doesn't use buf I suppose

[aaronc]

Before buf it was always expected a repo would copy all proto files to that repo manually including third party dependencies. Unfortunately I don't know of a better solution.

Also it might not be that hard to get it to work with buf. Not sure. Hopefully not. Is there a standard rust protoc plugin?

[julienrbrt]

related?: #12991

[julienrbrt]

We have added explanation about the change in the UPGRADING.md and a workaround. You are welcome to re-open if it still does not solve your issue.