How to use internal packages with go modules?

Question

I am using go modules in my project. I have shared code in the internal folder.

.
├── README.md
├── internal
│   └── shared
│       ├── request.go
│       └── request_test.go
└── web
    ├── README.md
    └── go
        └── src
            └── webservice
                ├── go.mod
                ├── go.sum
                └── main.go

I am not able to access the internal/shared from webservice while using go modules. I get the following error:

package internal/shared is not in GOROOT (/usr/local/go/src/internal/shared)

While importing from webservice in main.go:

import "internal/shared"

Note: I am trying to share internal/shared with another mod that is not listed above.

How to fix this issue?

Answer 1

I ended up fixing by adding a go.mod to the internal/shared and editing the go.mod in webservice with the following:

module webservice

go 1.14

replace example.com/shared => ../../../../internal/shared/

require (
    github.com/gorilla/mux v1.7.4
    github.com/spf13/viper v1.6.3
    github.com/stretchr/testify v1.5.1
    example.com/shared v0.0.0-00010101000000-000000000000
)

example.com/shared v0.0.0-00010101000000-000000000000 was generated by "go mod init webservice"