google/protobuf/descriptor.proto: File not found.

[brianstarke]

I have a project using grpc-gateway that was building correctly fairly recently, however when I set everything up from scratch on a new laptop I'm unable to build due the following error:

google/protobuf/descriptor.proto: File not found.
google/api/annotations.proto: Import "google/protobuf/descriptor.proto" was not found or had errors.
google/api/annotations.proto:26:8: "google.protobuf.MethodOptions" is not defined.
proto/lead.proto: Import "google/api/annotations.proto" was not found or had errors.

I'm on OSX, and set up everything as such:

wget https://github.com/google/protobuf/releases/download/v3.0.0-beta-3/protoc-3.0.0-beta-3-osx-x86_64.zip

mkdir temp
unzip -d temp protoc-3.0.0-beta-3-osx-x86_64.zip
mv temp/protoc /usr/local/bin

rm -rf temp
rm protoc-3.0.0-beta-3-osx-x86_64.zip

go get -u github.com/grpc-ecosystem/grpc-gateway/protoc-gen-grpc-gateway
go get -u github.com/grpc-ecosystem/grpc-gateway/protoc-gen-swagger
go get -u google.golang.org/grpc
go get -u github.com/golang/protobuf/{proto,protoc-gen-go}

And I've been attempting to generate as follows:

protoc -I/usr/local/include -I. \
 -I$GOPATH/src \
 -I$GOPATH/src/github.com/grpc-ecosystem/grpc-gateway/third_party/googleapis \
 --go_out=Mgoogle/api/annotations.proto=github.com/grpc-ecosystem/grpc-gateway/third_party/googleapis/google/api,plugins=grpc:. \
 proto/*.proto

The .proto:

syntax = "proto3";
package prequal;

import "google/api/annotations.proto";

service PrequalSvc {
  rpc Prequal(PrequalRequest) returns (PrequalResponse) {
    option (google.api.http) = {
      post: "/api/v1/prequal"
      body: "*"
    };
  }
}

Did I miss something in the setup?

[brianstarke]

PEBKAC, I'm an idiot.

If you just copy protoc without anything else in to /usr/local/bin, you're going to be missing a lot of stuff/have a bad time.

[dmlyons]

um, what else should I have copied, and where to?

[tmc]

@dmlyons I think the important thing is that the directory containing protoc should be on your PATH. @brianstarke can you confirm for posterity?

[brianstarke]

Yes, it was some time ago - but I believe that was the fix - my current rc has

export PATH="/usr/local/opt/protobuf@3.1/bin:$PATH"

And I've been building fine for months.

[gnomeria]

I have the same problem, could you please elaborate on your fix? I have used the --go_path to my workspace on customized go installation location.

[nwochaadim]

@brianstarke you are a live saver. I thought I had grown past issues like this.

[danforbes]

I believe that the solution refereneced here is to install from source, as described here.

[jackielii]

~/Downloads/protoc $ sudo cp -r bin include /usr/local/

[imranrazakhan]

On CentOS7 i installed protobuf-devel-3.6.1-4.el7.x86_64.rpm and it resolved my issue.