What's the Best Way to Update All Go Modules?

Understanding the Differences in "go update all modules" Methods

When attempting to update all modules for a Go project, various methods can produce different results, leading to confusion. This question explores the reasons for these discrepancies and identifies the recommended approach.

The main distinction lies in the sequence and purpose of the commands used:

• go get -u: Updates direct dependencies to their latest compatible versions, potentially introducing new indirect dependencies.
• go mod tidy: Cleans up redundancies and ensures a consistent dependency tree, potentially removing unnecessary dependencies.

The recommended approach for updating all modules is to combine these commands:

go get -u
go mod tidy

This sequence allows go get -u to update dependencies aggressively, while go mod tidy subsequently cleans up any unnecessary additions.

Manually deleting dependencies in go.mod can result in inconsistent updates, as go get -u and go mod tidy consult different dependency information sources. Therefore, it is not recommended.

Furthermore, to recursively update packages in subdirectories, the following command can be used:

go get -u ./...

To summarize, the preferred method for updating all modules is to run go get -u followed by go mod tidy. This approach ensures a consistent and comprehensive update process.

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