Hi Mark,
When importing a module package, the first element in the path must
contain a ".". Hence "foo" is invalid. Here is a working example:
$ cd $HOME
$ mkdir bar
$ cd bar
$ go mod init example.com/bar
go: creating new go.mod: module example.com/bar
$ cat <<EOD >bar.go
package bar
import "fmt"
func Hello() {
fmt.Println("Hello from bar!")
}
EOD
$ cd $HOME
$ mkdir foo
$ cd foo
$ go mod init example.com/foo
go: creating new go.mod: module example.com/foo
$ cat <<EOD >main.go
package main
import "example.com/bar"
func main() {
bar.Hello()
}
EOD
$ go mod edit -require=example.com/[email protected] -replace=example.com/bar=$HOME/bar
$ cat go.mod
module example.com/foo
require example.com/bar v0.0.0
replace example.com/bar => /root/bar
$ go run .
Hello from bar!
On Fri, 19 Oct 2018 at 21:42, Mark Volkmann <[email protected]> wrote:
>
> I have a simple demo application that wants to use a package that is on my
> local file system.
> The code for the package is in /Users/Mark/foo/bar.
> This directory contains the file bar.go which contains:
>
> package bar
> import "fmt"
> func Hello() {
> fmt.Println("Hello from bar!")
> }
>
> It also contains the file go.mod which just contains:
>
> module bar
>
> The demo application in another directory imports this as "foo/bar" in the
> file main.go.
> It has a go.mod file that contains the following:
>
> module demo
> replace foo/bar => /Users/Mark/foo/bar
>
> When I enter "go run main.go" in the directory of the demo code I get
> build demo: cannot find module for path foo/bar
>
> Is there something wrong with my use of the "replace" directive?
>
> None of this code is under the directory pointed to by GOPATH because I'm
> trying to use Go modules for everything in this demo.
>
> --
> R. Mark Volkmann
> Object Computing, Inc.
>
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