go 模块 - 替换不起作用 - 没有版本的替换模块必须是目录路径（根或以

Question

I just want to use a local package using go modules.

I have these files in a folder goweb:

and go.mod

module goweb

go 1.12

require mypack v0.0.0

replace mypack => ./src/mypack

But go.mod complains:

replacement module without version must be directory path (rooted or starting with .

go get -u./...

go: parsing src/mypack/go.mod: open <local path>/goweb/src/mypack/go.mod: no such file or directory
go: error loading module requirements

So I am missing some path structure here

Answer 1

If your app and the package it uses are part of the same go module, you don't have to add it to go.mod , you can just refer to it.

If they are not part of the same go module, then you can follow these steps:

The path you specify for the replace directive must be either an absolute path or a relative path, relative to the module's root .

So if mypack is a sibling of your module's root, you could use this:

replace mypack => ../mypack

Also, for this to work, you also have to "convert" mypack into a go module ( mypack must contain a go.mod file). Run go mod init mypack in its folder.

Also check out related question: How to use a module that is outside of "GOPATH" in another module?

Answer 2

I had this scenario while updating from Go 1.12 to Go 1.19; Quite a lot has changed.

I had the Protobuffer files in a separte folder called interfaces out as shown below.

Inside each microservice_x I was creating a directory called generated to hold the protoc generated artefacts.

Now I need to do a go mod init in the generated folder; along with the replace keywords in respective go mod files

Illustrative code here https://github.com/alexcpn/go_grpc_2022 for better understanding. Please check the Make file where the build is happening.

go_grpc_2022$ tree
.
├── interfaces
│   └── microservice_1
│       └── test.proto
├── LICENSE
├── microservice_1
│   ├── generated
│   │   ├── go.mod
│   │   ├── microservice_1
│   │   │   ├── test_grpc.pb.go
│   │       └── test.pb.go
│   ├── go.mod
│   ├── go.sum
│   ├── integration_test
│   │   └── validation_test.go
│   ├── Makefile
│   ├── server
│   │   ├── go.mod
│   │   ├── go.sum
│   │   └── server.go
│   ├── test_client
│   │   └── client.go
│   └── test_server
│       ├── go.mod
│       ├── go.sum
│       └── main.go
└── README.md