How deeply does Go in Action, Second Edition cover go mod tidy?

Explains cleanup, addition, and checksum updates, but does not detail the command’s internal resolution algorithm.

Go mod tidy

As explained in Go in Action, Second Edition

go mod tidy is a Go command that synchronizes module dependencies and their checksums with the packages imported by a project.

go mod tidy synchronizes a Go module’s declared dependencies and checksums with the packages imported by the project. section 11.1

Running the command keeps module metadata aligned by:

Removing dependencies no longer imported. section 11.1
Adding missing dependencies imported by the code. section 11.1
Updating go.sum with dependency and go.mod checksums. section 11.1

After adding an import

Add a dependency’s package path to Go code, then run go mod tidy. The command fetches the dependency, records it in go.mod, and updates go.sum so builds use verified module contents. section 11.1

go mod tidy

Run the command from the module directory to reconcile imports, go.mod, and go.sum. section 11.1

How Go in Action, Second Edition covers it

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Also explained in

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Go in Practice, Second Editiongo mod tidy is a Go command that adds missing module requirements and removes unnecessary ones from module metadata.

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Related concepts

go.sumproduces · go.sum is a Go module checksum file that records cryptographic checksums for downloaded module dependencies.
go.mod fileproduces · A go.mod file is a Go module manifest that declares the module path, Go language version, and required dependencies.
dependency graphconfigures · A dependency graph is a graph whose nodes represent entities and whose edges represent dependency relationships among them.
go moduleconfigures · A Go module is a versioned collection of related Go packages defined by a go.mod file and managed as a unit for dependency resolution and builds.

This explainer was generated by Manning's knowledge graph from the text of Go in Action, Second Edition. The section links point to the parts of the book it draws on.