How go.work knows which module refers to which folder

[Jack Li]

Hi group,

In the go.mod replace way, there’s a one-to-one mapping relationship, for example, the module example.com/hello is mapped to folder …/hello

```

$ go mod edit -replace example.com/hello=../hello

$ view go.mod

replace example.com/hello => ../hello 

$

```

Now with the go.work way. If I've got three repos or modules like this:

```

module main

go 1.18

require example1.com/hello v1.0.0

require example2.com/hello v1.0.0

require example3.com/hello v1.0.0

```

How can go.work know which module above, refers to ./hello ?

```

go.work:

use ./hello

```

Thanks

[thepud...@gmail.com]

Hi there,

I might be misunderstanding your question, but a 'use' directive in a go.work file points to a directory. 

In your example, there would not be any ambiguity -- 'use ./hello' in a go.work file would refer to whatever module you have located in the 'hello' directory in your local filesystem immediately below the go.work file.

From the Go workspaces reference (https://go.dev/ref/mod#workspaces) :

> A 'use' adds a module on disk to the set of main modules in a workspace. Its argument is a relative path to the directory containing the module’s go.mod file. A 'use' directive does not add modules contained in subdirectories of its argument directory. Those modules may be added by the directory containing their go.mod file in separate 'use' directives.

Hope that helps, and sorry if that does not address your question.

Regards,
thepudds

[Jack Li]

Thanks.

I think I may get it.

If there's go.work, the `import example.com/module` will try those local directories in go.work first. If not found, it will try online repositories. And module names like this `example.com/module`, `github.com/golang/glog`, etc. are unique, so there will be no ambiguous. Am I thinking right?

------------------ Original ------------------

From: "thepud...@gmail.com" <thepud...@gmail.com>;

Date: Wed, Apr 6, 2022 11:57 PM

To: "golang-nuts"<golan...@googlegroups.com>;

Subject: [go-nuts] Re: How go.work knows which module refers to which folder

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