How to Access Local Packages within a Go Module?

Accessing Local Packages within a Go Module (Go 1.11)

When working with Go's module system, it's often necessary to access local packages that are not part of the module's dependencies. In such cases, the following steps can be taken:

1. Use Replace Directive: If the local package is in a separate physical path, add a "replace" directive to the main module's go.mod file. This directive tells the module system to use the local package instead of the published version on a remote repository. The syntax is as follows:

replace <package path> <version> => <local physical path>

2. Specify Package Path: Within the main code, import the local package using its full package path. For example, if the package is located in a directory named platform, the import statement would be:

import "<full path to platform package>/platform"

3. Run Build Command: Run the go build command to compile the program. It should now successfully build, recognizing and using the local package.

Example:

Consider a project with the following structure:

- /platform
    - platform.go
- main.go
- go.mod

The go.mod file for the main module includes the following lines:

module github.com/userName/mainModule

replace "github.com/userName/otherModule" v0.0.0 => "/path/to/local/otherModule"

In main.go, the local package can be imported as:

import "github.com/userName/otherModule/platform"

By following these steps, local packages can be readily utilized within a Go module, facilitating seamless development and testing.

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