How Can I Best Update All Go Modules and Their Dependencies?

Update All Modules in Go: Methods and Best Practices

When working with Go modules, you may encounter the need to update all dependencies simultaneously. Several methods can achieve this, each producing slightly different results.

Methods and Results:

1. go get -u: Updates dependencies using a non-aggressive approach. Results in a go.mod file with 19 lines.
2. go get -u; go mod tidy: Same as above, followed by a cleanup using mod tidy. Reduces go.mod to 14 lines.
3. go mod tidy: Only tidies up the current go.mod file, preserving any explicit requirements. Results in a 13-line go.mod.
4. Manual deletion of dependencies: Deleting all dependencies in go.mod and running go mod tidy yields a 12-line go.mod.
5. Manual deletion of dependencies go get -u: Deleting all dependencies and running go get -u results in a go.mod with 11 lines.

Why the Differences?

The differences arise due to the varying levels of dependency resolution performed by each method. go get -u aggressively pulls in the latest compatible dependencies, while go mod tidy performs a more conservative cleanup. Manually deleting dependencies and running go get -u or go mod tidy allows you to specify which dependencies to update.

Recommended Approach:

For a clean and comprehensive update, it is recommended to use the following command sequence:

go get -u
go mod tidy

This approach first updates the dependencies using go get -u and then cleans up any unnecessary or redundant dependencies with go mod tidy.

Updating Recursively:

To recursively update modules in subdirectories, use the following command:

go get -u ./...

This will recursively update all modules in the current directory and its subdirectories.

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