How to import local packages without gopath

Question

I\'ve used GOPATH but for this current issue I\'m facing it does not help. I want to be able to create packages that are specific to a project:

Answer 1

You can use replace

go mod init example.com/my/foo

foo/go.mod

module example.com/my/foo

go 1.14

replace example.com/my/bar => /path/to/bar

require example.com/my/bar v1.0.0

foo/main.go

package main
import "example.com/bar"

func main() {
    bar.MyFunc()
}

bar/go.mod

module github.com/my/bar

go 1.14

bar/fn.go

package github.com/my/bar

import "fmt"

func MyFunc() {
    fmt.Printf("hello")
}

Importing a local package is just like importing an external pacakge

except inside the go.mod file you replace that external package name with a local folder.

The path to the folder can be full or relative /path/to/bar or ../bar

• https://github.com/golang/go/wiki/Modules#when-should-i-use-the-replace-directive
• https://thewebivore.com/using-replace-in-go-mod-to-point-to-your-local-module/

Answer 2

I have a similar problem and the solution I am currently using uses Go 1.11 modules. I have the following structure

- projects
  - go.mod
  - go.sum
  - project1
    - main.go
  - project2
    - main.go
  - package1
    - lib.go
  - package2
    - lib.go

And I am able to import package1 and package2 from project1 and project2 by using

import (
    "projects/package1"
    "projects/package2"
)

After running go mod init projects. I can use go build from project1 and project2 directories or I can do go build -o project1/exe project1/*.go from the projects directory.

The downside of this method is that all your projects end up sharing the same dependency list in go.mod. I am still looking for a solution to this problem, but it looks like it might be fundamental.