How do I properly use Go 1.6\'s new vendoring feature to import third-party packages, specifically goji, in my project?

Vendoring in Go 1.6: An In-depth Explanation

Importing third-party packages using Go's new vendoring feature in version 1.6 can be a challenge. To help clarify the process, let's address a specific use case with Goji.

Project Structure

The project structure you provided is correct, with the vendor directory located under src.

main.go

Your main.go file correctly imports the necessary packages from goji. However, it's important to note that the vendor directory needs to be properly initialized by running the following command first:

go mod vendor

This command will create a vendor/manifest file, which lists all the vendored dependencies.

Environment Variables

The provided environment variables are set correctly. Make sure that GOPATH is set to the directory containing your project's src folder.

Build Commands

The go run and go build commands you tried will not work as expected because they search for packages in the default GOPATH, not in the vendor directory.

Solution

To build your program with vendoring, use the following command:

go build -mod=vendor ./src/main.go

Explanation

The -mod=vendor flag instructs the go build command to use the vendored dependencies instead of searching the default GOPATH for them.

Alternative Approach

If you wish to avoid using the vendor directory, you can manually specify the full path to the goji package in your import statement:

import "github.com/zenazn/goji/web"

Note that you will need to run go mod init to initialize a go.mod file in your project directory.

By following these steps, you should be able to successfully import third-party packages using vendoring in Go 1.6.

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