How are submodule versions managed in a Go repository with multiple go.mod files?

Managing Submodule Versioning in Go

When a Go repository contains multiple go.mod files, understanding how submodule versions are managed is crucial. In the provided example, a go.mod file exists in the root and subdirectory. This raises the question of how submodule versions are released and updated.

Submodule Versioning

Contrary to intuition, submodule versions do not necessarily align with those of the parent module. They are considered independent modules within the same repository. Therefore, updating the root module does not always update the submodule.

Go Tagging and Release Management

To manage submodule versioning, Go leverages Git tags. Tags serve as release markers for specific versions. Hierarchical Git tags are used to mark submodule versions. In the given example, the latest version of vault is 1.3.3, while the latest tag for vault/api is 1.0.4.

Updating Submodule Versions

To update the vault/api submodule, simply use go get to retrieve the latest version:

<code class="go">go get github.com/hashicorp/vault/api</code>

Go will automatically detect and install the latest submodule version without specifying it in go.mod.

Conclusion

Understanding submodule versioning is crucial when working with multiple go.mod files. Submodules are independent entities with their own versioning mechanisms, and updating them requires a separate go get command without explicitly specifying versions. Hierarchically structured Git tags are used to mark specific releases of submodules.

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