How are Submodule Versions Managed in a Go Repository?

Managing Versions of Sub Modules in Go Repository

Consider a situation where a Go repository contains a go.mod file in both the root directory and a subdirectory. In such cases, understanding how the versions of the submodule are released is crucial.

Submodule Version Management

Unlike parent modules, the versions of submodules are not necessarily synchronized. They are treated as distinct modules residing within the same repository structure.

To determine the available versions of a submodule, refer to its release information. For example, in the case of github.com/hashicorp/vault/api, visit https://github.com/hashicorp/vault/releases to check the official releases and tags.

Hierarchical Git Tags and Submodule Versions

Go uses hierarchical Git tags to mark submodule versions. This implies that the versions of submodules do not always correspond to the parent module's version. For instance, vault could be at version 1.3.3, while its submodule api might be at version 1.0.4.

Updating Submodule Versions

To update a submodule's version, use go get. For example, to get the latest version of github.com/hashicorp/vault/api, run:

go get github.com/hashicorp/vault/api

You don't need to specify the version explicitly in go.mod during the initial import. The Go tool automatically fetches the latest version.

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