kubectx and kubens no longer work on macOS due to missing readlink -f option about kubectx

[ahmetb]

Fixed, try with brew update && brew upgrade.

[lypht]

@koenrh I just ran into this myself. The following resolved my local instance:

brew install coreutils

I then added gnubin to my path by appending

export PATH="/usr/local/opt/coreutils/libexec/gnubin:$PATH" to $HOME/.bash_profile, and restarting my terminal.

I agree that the additional case requirement would be a helpful addition, but until that point, if others are using this fantastic tool, these three steps might help some folks.

[ahmetb]

My bad. I keep forgetting gnu coreutils is installed on my Mac. I wonder if we can do without -f and without checking for greadlink.

[rfay]

In the brew recipe you might be able to make coreutils a dependency and then use greadlink? Seems like a hard sell.

[ahmetb]

Since readlink -f fails only on BSD coreutils which is on mac, I think we can safely assume Python is installed. So I am changing the way to determine SCRIPT_DIR to this, which falls back to Python:

SCRIPT_DIR="$(dirname $( readlink -f "${0}" 2>/dev/null || \
  python -c "import os,sys; print(os.path.realpath(sys.argv[1]))" "${0}" ))"

Every method I found without introducing GNU coreutils dependency is just a hack, including this one. I’ll submit a PR soon and make a release. Sorry for the disruption.

[koenrh]

@ahmetb What do think of this? https://github.com/kubernetes/kubernetes/blob/b353700bfc1ee95b8f9f827c9cc818cf2ab3f943/hack/lib/init.sh#L111-L128

[ahmetb]

@koenrh it's nice but we would be copying it to 2 files, both kubens/kubectx scripts. So I prefer a one-liner more.

[rfay]

Works for me, thanks!