A toy repo used to test the functionality of "go mod why".

Mod Why Test

Discussion

From a module perspective:

The main module (github.com/ejweber/mod-why-test) has a single direct dependency (github.com/ejweber/mod-why-test/direct-mod). This direct dependency has two transitive dependencies (github.com/ejweber/mod-why-test/transitive-used-mod and github.com/ejweber/mod-why-test/transitive-unused-mod).

github.com/ejweber/mod-why-test 
|-- github.com/ejweber/mod-why-test/direct 
    |-- github.com/ejweber/mod-why-test/transitive-used-mod 
    |-- github.com/ejweber/mod-why-test/transitive-unused-mod

From a package perspective:

The main package imports only one package (github.com/ejweber/mod-why-test/direct-mod/direct-used-pkg). That package imports only one package (github.com/ejweber/mod-why-test/transitive-used-mod/transitive-used-pkg).

github.com/ejweber/mod-why-test/main
|-- github.com/ejweber/mod-why-test/direct-mod/direct-used-pkg
    |-- github.com/ejweber/mod-why-test/transitive-used-mod/transitive-used-pkg

github.com/ejweber/mod-why-test/transitive-unused-mod DOES appear in the module dependency graph (because it is a direct dependency of the main module's direct dependency).

--> go mod graph
mod-why-test github.com/ejweber/mod-why-test/[email protected]
github.com/ejweber/mod-why-test/[email protected] github.com/ejweber/mod-why-test/[email protected]
github.com/ejweber/mod-why-test/[email protected] github.com/ejweber/mod-why-test/[email protected]

However, github.com/ejweber/mod-why-test/transitive-unused-mod is NOT actually a transitive dependency of the main module, because absolutely none of its code is involved in the build of the main modules packages.

"go mod why -m all" recognizes that github.com/ejweber/mod-why-test/transitive-unused-mod is NOT actually required, but that github.com/ejweber/mod-why-test/transitive-used-mod IS required:

--> go mod why -m all
# mod-why-test
mod-why-test

# github.com/ejweber/mod-why-test/direct-mod
mod-why-test
github.com/ejweber/mod-why-test/direct-mod/direct-used-pkg

# github.com/ejweber/mod-why-test/transitive-unused-mod
(main module does not need module github.com/ejweber/mod-why-test/transitive-unused-mod)

# github.com/ejweber/mod-why-test/transitive-used-mod
mod-why-test
github.com/ejweber/mod-why-test/direct-mod/direct-used-pkg
github.com/ejweber/mod-why-test/transitive-used-mod/transitive-used-pkg

"go mod why all" recognizes that none of the packages from github.com/ejweber/mod-why-test/transitive-unused-mod are required but that packages from github.com/ejweber/mod-why-test/transitive-used-mod ARE required:

--> go mod why all
# github.com/ejweber/mod-why-test/direct-mod/direct-used-pkg
mod-why-test
github.com/ejweber/mod-why-test/direct-mod/direct-used-pkg

# github.com/ejweber/mod-why-test/transitive-used-mod/transitive-used-pkg
mod-why-test
github.com/ejweber/mod-why-test/direct-mod/direct-used-pkg
github.com/ejweber/mod-why-test/transitive-used-mod/transitive-used-pkg

# mod-why-test
mod-why-test

Conclusion

github.com/ejweber/mod-why-test/transitive-unused-mod should NOT be considered a transitive dependency of the main module. github.com/ejweber/mod-why-test/transitive-used-mod SHOULD be considered a transitive dependency of the main module. "go mod why -m all" is capable of correctly making this determination.

Owner
Eric Weber
Solutions software engineer for NetApp E-Series Group
Eric Weber
https://github.com/ejweber/mod-why-test
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