Is that possible to import a local package inside ~/go/src/ from a module?

Question

I am using go module, the file structure is like this:

~/some_path/goapp/go.mod
~/some_path/goapp/go.sum
~/some_path/goapp/main.go

~/go/src/fakedomain.com/fakeuser/foo/foo.go

Inside main.go, I tried to do

import fakedomain.com/fakeuser/foo

But, it doesn't work at all. I tried to add the following to go.mod:

require fakedomain.com/fakeuser/foo 

OR

require fakedomain.com/fakeuser/foo
replace fakedomain.com/fakeuser/foo /home/user/go/src/fakedomain.com/fakeuser/foo

None of them works. How can I achieve this?

Edited

This question is about how to import a local package inside ~/go/src/ from a module which is outside ~/go/src/.

In other words, the module which is outside ~/go/src/ will import a local package inside ~/go/src/. I thought I could import it directly (that is what I did in the old days without module), but I was wrong. It turns out that I have to make the local package inside ~/go/src/ become a module too.

Answer 1

Thank @MartinTournoij, @Peter, @DaveC very much for their help and comments which I have upvoted. After following all the directions, I finally make it work.

(Btw, I really shouldn't trust VSCode error message too much. Because I normally check errors from VSCode. Thus I didn't try go build before asking this question. I thought they should return the same error, but they are not. go build provides more reasonable error messages than VSCode.)

There were three problems.

• Missing version from require in go.mod
• Missing => from replace in go.mod
• Missing go.mod for foo package.

So to make it work:

File Structure:

~/some_path/goapp/go.mod
~/some_path/goapp/go.sum
~/some_path/goapp/main.go

~/go/src/fakedomain.com/fakeuser/foo/foo.go
~/go/src/fakedomain.com/fakeuser/foo/go.mod

~/some_path/goapp/go.mod:

...
require fakedomain.com/fakeuser/foo v0.0.0
replace fakedomain.com/fakeuser/foo => /home/user/go/src/fakedomain.com/fakeuser/foo

main.go:

package main
import fakedomain.com/fakeuser/foo
...

~/go/src/fakedomain.com/fakeuser/foo/go.mod:

module fakedomain.com/fakeuser/foo

go 1.12