gogo.proto：找不到文件

Question

protoc --gogofaster_out=. image.proto

I get this error message

/home/abc/src/github.com/gogo/protobuf/gogoproto/gogo.proto: File not found.

image.proto: Import "/home/abc/src/github.com/gogo/protobuf/gogoproto/gogo.proto" was not found or had errors.

The file is definitely there. I can reach it from the reported path in the error.

My proto file looks like this:

package image;

import "/home/abc/src/github.com/gogo/protobuf/gogoproto/gogo.proto";

message Frame {
required bool fragment = 1; 
required int32  fragmentID = 2; 
required bool lastFragment = 3; 
required bytes data = 4;
}

I have a Makefile in the dir where the proto file is. Looks like this:

regenerate:
--proto_path=../../github.com/gogo/protobuf/gogoproto:../../github.com/gogo/protobuf/protobuf/google/protobuf:. --gogofaster_out=. *.proto

What can I do to resolve the path error?

Answer 1

As in this issue, you could try and import only the relative path:

import "github.com/gogo/protobuf/gogoproto/gogo.proto";

Make sure that GOPATH is set to /home/abc first.

I mention protobuf PR 241, where the makefile defines the PATH to use:

regenerate: 
  protoc-min-version --version="3.0.0" 
    --proto_path=$(GOPATH)/src/image:
                 $(GOPATH)/src/github.com/go‌​go/protobuf/protobuf‌​:
                 $(GOPATH)/src/githu‌​b.com/gogo/protobuf/‌​protobuf/google/prot‌​obuf:
                 . --gogo_out=. *.proto 

The OP mention this thread, which points out:

The dependencies call other dependencies in "google/protobuf/", so these need to be in the path correctly also.
The errors are pretty misleading

Also when using gogoproto extensions you should use gogofast_out.
gofast_out is only for when you are not using any extensions, but want some extra speed.
gogofast_out / gofast_out has no side effects.
gogofaster_out makes most fields nullable=false.