Fix / set homebrew multiuser permissions

fix-group-brew.sh

#!/bin/bash

# reference: http://blog.strug.de/2012/06/my-homebrew-multi-user-setup/
# usage: bash -c "$(curl -fsSL https://gist.githubusercontent.com/cburyta/9ecaa7463086c6484480/raw/4f756d43fd1b7aebccec6ea49f30dd3b3faf76f0/fix-group-brew.sh)"

# stop if brew doctor fails
set -e

echo "Ensure we have a 'brew' group, if not exists create the brew group before continuing."
dscl . -read /Groups/brew

echo "Ensure the current user is in the brew group"
id $(whoami) | grep brew

echo "Ensure Homebrew install looks A-OK"
brew doctor

echo "... Change the group of homebrew installation directory"
sudo chgrp -R brew /usr/local 

echo "... Allow group members to write inside this directory"
sudo chmod -R g+w /usr/local

echo "... Change the group of homebrew cache directory"
sudo chgrp -R brew /Library/Caches/Homebrew

echo "... Allow group members to write inside this directory"
sudo chmod -R g+w /Library/Caches/Homebrew

echo "... Checking brew doctor again"
brew doctor