How to Resolve Module Conflicts with Go Module Sub-Modules?

Resolving Module Conflicts with Sub-Modules

Encountering conflicts in Go module dependencies can be frustrating, especially when a top-level module and its sub-module are imported separately as different versions. This issue arises when one or more dependencies reference a pre-Go modules version of a module or sub-module, resulting in the retrieval of both module and sub-module dependencies.

Identifying the Conflict

In the example provided, the module dependency graph resembles the following:

├── main module (github.com/test-org/test-repo)
│   ├── github.com/foo/bar v1.0.0
│   └── github.com/raz/mataz v1.0.0
└─────github.com/shared/dependency
      ├── submodule: github.com/shared/dependency/api
      └── two downloaded versions:
          - v1.1.0 (module-less version)
          - v1.2.0 (Go module version)

Addressing the Conflict

The ambiguous import error in this case indicates a conflict between the module reference to github.com/shared/dependency/api and the black box import of the github.com/shared/dependency repo. To resolve this, we need to enforce a consistent version of the module and sub-module.

Solution: Using replace Directive

The solution is to add a replace directive in the main module's go.mod file. This directive forces all references to the sub-module to use a specific version. In this example, we force references to use github.com/shared/dependency v1.2.0, which is a Go module-enabled version.

replace (
    github.com/shared/dependency => github.com/shared/dependency v1.2.0
)

Note: This solution assumes that all dependencies still require the usage of Go-module-enabled versions of github.com/shared/dependency. If this is not the case, other solutions may be necessary, such as modifying the referenced dependency versions or using a dependency management tool like Glide.

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