Create single GOROOT on MacOS with golang installed with brew

goroot-update

#!/bin/bash

src=$(go env GOROOT)
dst=$(brew --prefix)/Cellar/go/libexec

dst_link=$(readlink -f ${dst})

if [ $? -ne 0 ]; then
  echo "Create GOROOT symlink to latest go version"
  echo "${src} -> ${dst}"
  ln -s ${src} ${dst}
  exit $?
fi

if [ ${dst_link} != ${src} ]; then
  echo "Update GOROOT symlink"
  echo "Old: ${dst_link} -> ${dst}"
  echo "New: ${src} -> ${dst}"
  unlink ${dst}
  ln -s ${src} ${dst}
  exit $?
fi


echo "GOROOT symlink is up to date"