What is the "M" argument on the command line?

[tokuki-ho]

Hi , with latest docker image(v1.10.1), I get a error:

| Please specify either:
|      • a "go_package" option in the .proto source file, or
|      • a "M" argument on the command line.

What is a "M" argument on the command line. and how to pass it to command line?
(I don't want to add go_package to proto file)

[wedothings]

Also, struggling with this

[higansama]

So do i

[HairyMike]

This is the output from protoc which is executed on the container (by the go code - here).

The current latest version of gripmock requires a go_package option at the top of your protobuf files. Good news is that theres a Pull Request being worked on that will remove the need for this.