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chown is basically piggybacking on the previous chgrp implementation which is why refactoring chgrp was also necessary.
Some tests strictly require root because they change the owner and must be run with
sudo -E cargo test --features "posixutils_test_all requires_root". I tried to maximize the tests that can be run in GitHub by detecting root access and only changing the group (ex.chown :group file) when not run as root.