Go Modules: All-or-Nothing Transition from GOPATH?

Understanding Go Modules in Private Repos and the Gopath

When migrating internal codebases from dep to go modules, certain considerations arise. This article delves into the expectations and consequences of using go modules, particularly in relation to private repositories and the gopath.

Go Modules and the Gopath

According to the Go project architects, "dotless" paths (without a preceding dot) are intended exclusively for the standard library. Internally developed dependencies should not use this notation.

Once a project transitions to using go modules, it must fully embrace the module system. The gopath then becomes functionally identical to a module cache.

Consequences of Modules and Private Repos

This transition to modules necessitates managing dependencies through private repositories. Consequently, developers may face the following consequences:

• Remote Dependency Iterations: Developers may need to push and pull changes to remote repositories to iterate on private module dependencies.
• Merging Repositories: Alternatively, developers can merge all repositories into a single, more centralized one.

Your Key Assumption

Your assumption that all dependencies in a go module project must be resolved through the module system is correct. The gopath serves solely as a cache for downloaded modules.

Question: Are go modules all-or-nothing?

Yes, go modules are all-or-nothing. Once a project adopts modules, all dependencies must be modularized. The gopath only retains its significance as a cache for downloaded modules.

Resolving Dependencies Explciitly from the Gopath

There is no way to explicitly indicate that a dependency should be resolved from the gopath.

Additional Insights

• Moving myprogram outside of the gopath does not resolve the issue.
• Running 'go mod init' in the mylib directory does not affect the situation.
• Utilizing $GOPROXY can facilitate offline development with private module dependencies.

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