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9a83015e60
Our `realpath` and `readlink -f` functions (required only because of MacOS, thanks Steve) were poor substitutes at best. Mostly they were downright broken. This thoroughly overhauls them and adds a test (in comments, since we don't seem to have shell tests). For all the interesting cases I could think of, the fakes act just like the real thing. Then use those and canonicalize KUBE_ROOT. In order to make recursive calls of our shell tool not additively grow `pwd` we have to essentially make the sourcing of init.sh idempotent.