proto structure with imports of other protos

[lee-aaron]

Hi,

I've seen other issues and tried googling a bunch but don't see much on the correct structure for this kind of issue.

Say you have a bunch of protos in different directories ie:

proto/
  a/
    a1/
      a2/
       a3/
         sample.proto
  b/
    b1/
       b2/
         auth.proto
  googleapis/ [git submodule]
    google/
       api/
         annotations.proto
         auth.proto

If you import auth.proto as well as google annotations in sample.proto, what's the correct way the build.rs and lib.rs supposed to look like?

syntax = "proto3';

package sample;

import "b/b1/b2/auth.proto";
// many more local imports
import "c/c1/c2/c3/foo.proto";
// ...
import "google/protobuf/timestamp.proto";
import "google/protobuf/duration.proto";

tonic_build::configure()
  .build_client(true)
  .build_server(false)
  .compile(
    &["proto/a/a1/a2/a3/sample.proto"],
    &["proto/a"],
  )?;

I'm getting a bunch of file not found for various locally imported protos so not sure what I'm doing wrong. The error messages weren't super intuitive as to where it was trying to look for the protos.